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Articles 1411 - 1440 of 1524
Full-Text Articles in Physical Sciences and Mathematics
Transdermal Drug Delivery: Microfabrication Insights, Ciprian Iliescu, Bangtao Chen, Jiashen Wei, Zhilian Yue
Transdermal Drug Delivery: Microfabrication Insights, Ciprian Iliescu, Bangtao Chen, Jiashen Wei, Zhilian Yue
Australian Institute for Innovative Materials - Papers
The paper presented an enhancement solution for transdermal drug delivery using microneedles array with biodegradable tips. The microneedles array was fabricated by using deep reactive ion etching (DRIE) and the biodegradable tips were made to be porous by electrochemical etching process. The porous silicon microneedle tips can greatly enhance the transdermal drug delivery in a minimum invasion, painless, and convenient manner, at the same time; they are breakable and biodegradable. Basically, the main problem of the silicon microneedles consists of broken microneedles tips during the insertion. The solution proposed is to fabricate the microneedle tip from a biodegradable material - …
Generation Of Terahertz Radiation By Bulk And Surface Optical Rectification From Crystal Planes Of Arbitrary Orientation, Stuart Hargreaves, Krunal Radhanpura, Roger A. Lewis
Generation Of Terahertz Radiation By Bulk And Surface Optical Rectification From Crystal Planes Of Arbitrary Orientation, Stuart Hargreaves, Krunal Radhanpura, Roger A. Lewis
Australian Institute for Innovative Materials - Papers
The theory of second-order nonlinear bulk and third-order nonlinear surface electric-field-induced optical rectification is developed for zinc-blende 4¯3m crystal faces of arbitrary indices (hkl). The theory is then used to account for our experimental results for terahertz generation from GaAs high-index planes (11N)A and (11N)B, where N=2, 3, 4, and 5. The data combined with the calculations allow us to demonstrate that a surface field is present on both the Ga-rich and As-rich faces and to determine that the signs are opposite and that the strengths are similar. Such conclusions are inaccessible by work restricted to low-index planes.
The Generation Of Terahertz Frequency Radiation By Optical Rectification, Krunal Radhanpura, Stuart Hargreaves, Roger A. Lewis
The Generation Of Terahertz Frequency Radiation By Optical Rectification, Krunal Radhanpura, Stuart Hargreaves, Roger A. Lewis
Australian Institute for Innovative Materials - Papers
One of the means of generating terahertz (THz, 1012 Hz) frequency radiation is through the bulk second-order nonlinear effect of optical rectification. Optical rectification occurs if high-intensity light is directed onto an electrooptic material such as ZnTe. If the excitation beam contains components of two or more frequencies then difference-frequency mixing, also known as optical rectification, may take place. Depending on the spectrum of the excitation beam, the resulting frequency may be in the THz range. While this phenomenon has been known for some time, and has been studied in various zinc blende crystals, attention does not seem to …
Studies Of The Electroresistive Properties Of Electronic Oxides, Jonathan Knott, Roger A. Lewis
Studies Of The Electroresistive Properties Of Electronic Oxides, Jonathan Knott, Roger A. Lewis
Australian Institute for Innovative Materials - Papers
In this paper we report on the non-linear voltage-current relationship of three doped lanthanum manganite compounds (La0.8Li0.2MnO3, La0.66Sr0.33MnO3 and La0.8Pb0.2MnO3) and three manganite cobaltite compounds (DyMn0.5Co0.5O3, HoMn0.5Co0.5O3 and NdMn0.5Co0.5O3). We compare and contrast the magnitude and temperature dependence of the non-linear behaviour, and suggest this behaviour may be largely due to phase separation in the compounds. We also compare the behaviour of single-crystal and polycrystalline bulk samples of lead-doped lanthanum manganite (La0.8Pb0.2MnO3), which provide evidence for grain boundaries playing an important role in the non-linear voltage-current relationships in certain compounds.
Vortex Phase Boundaries From Ferromagnetic Measurements In A Patterned Disc Array, Ching-Ching Tsai, J Choi, Sunglae Cho, S J. Lee, Bimal K. Sarma, C Thompson, O Chernyashevskyy, Ivan Nevirkovets, V Metlushko, K Rivkin, J B. Ketterson
Vortex Phase Boundaries From Ferromagnetic Measurements In A Patterned Disc Array, Ching-Ching Tsai, J Choi, Sunglae Cho, S J. Lee, Bimal K. Sarma, C Thompson, O Chernyashevskyy, Ivan Nevirkovets, V Metlushko, K Rivkin, J B. Ketterson
Australian Institute for Innovative Materials - Papers
Using a recently developed broadband microwave measurement technique, we have studied the hysteretic appearance and disappearance with in-plane magnetic field of the uniform ferromagnetic resonance (FMR) mode of a patterned permalloy disk array. The observed features are consistent with our micromagnetic simulations (performed on an infinite array of such disk), which predict that on decreasing the magnetic field from a positively magnetized state at positive fields the array will: (i) pass continuously into a double-vortex state; (ii) followed by a discontinuous transition to a single-vortex state; and finally (iii) discontinuously into a negatively magnetized state at some negative field. The …
Fabrication And Superconducting Properties Of Highly Dense Mgb2 Bulk Using A Two-Step Sintering Method, Minoru Maeda, Yue Zhao, Yoshifumi Watanabe, Hiroaki Matsuoka, Y Kubota
Fabrication And Superconducting Properties Of Highly Dense Mgb2 Bulk Using A Two-Step Sintering Method, Minoru Maeda, Yue Zhao, Yoshifumi Watanabe, Hiroaki Matsuoka, Y Kubota
Australian Institute for Innovative Materials - Papers
We investigated on microstructure and superconducting properties of high-density MgB2superconductors synthesized by a heat-treatment method combining a short period of sintering at 1100°C with a following annealing at a low temperature. The two-step sintering method was found to achieve a coexistence of a high density and broadened XRD full width at half maximum (FWHM) of MgB2 peak in the samples. The onset of diamagnetism at 5 T was approximately 2 K higher than those of the samples heat-treated by single-step sintering at high or low temperatures. Different second-step annealing temperatures were examined in this work. …
Crystal Structure And Electronic And Thermal Properties Of Tbfeaso0.85, N Kaurav, Y.T Chung, Y.K Kuo, R S Liu, T S Chan, J.M Chen, J.F Lee, H.S Sheu, Xiaolin Wang, S X. Dou, Sung-Ik Lee, Y.G Shi, A.A Belik, K Yamaura, E Takayama-Muromachi
Crystal Structure And Electronic And Thermal Properties Of Tbfeaso0.85, N Kaurav, Y.T Chung, Y.K Kuo, R S Liu, T S Chan, J.M Chen, J.F Lee, H.S Sheu, Xiaolin Wang, S X. Dou, Sung-Ik Lee, Y.G Shi, A.A Belik, K Yamaura, E Takayama-Muromachi
Australian Institute for Innovative Materials - Papers
The crystal structure and the electronic and thermal properties of a high-quality polycrystalline TbFeAsO0.85 sample made by a high-pressure technique are investigated. The crystal structure, as determined by synchrotron X-ray powder diffraction, possesses a tetragonal unit cell (space group: P4/nmm) with lattice parameters of a=b=3.8851 Å and c =8.3630 Å. In order to elucidate the electronic structure and oxidation states of corresponding elements, X-ray absorption near-edge structure (XANES) spectra are presented. The XANES spectra confirm that the oxidation states of Fe, As, and Tb in the TbFeAsO0.85 sample are ~Fe2+, …
A Superconducting Transistorlike Device Having Good Input-Output Isolation, Ivan Nevirkovets
A Superconducting Transistorlike Device Having Good Input-Output Isolation, Ivan Nevirkovets
Australian Institute for Innovative Materials - Papers
A multiterminal superconducting device with the S1IS2FIS3 structure (where S, I, and F denote a superconductor, an insulator, and a ferromagnetic material) is fabricated and characterized. Introducing a thin ferromagnetic layer into the middle electrode dramatically reduces parasitic back action of the acceptor junction (S1IS2) bias current on the injector junction (S2FIS3)current-voltage characteristic as compared with that for the formerly reported quiteron, a device exploiting similar operation principle.
Dehydrogenation/Rehydrogenation Mechanism In Aluminum Destabilized Lithium Borohydride, Xuebin Yu, Guanglin Xia, Zaiping Guo, Hua-Kun Liu
Dehydrogenation/Rehydrogenation Mechanism In Aluminum Destabilized Lithium Borohydride, Xuebin Yu, Guanglin Xia, Zaiping Guo, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
LiBH4/Al mixtures with various mol ratios were prepared by ball milling. The hydrogen storage properties of the mixtures were evaluated by differential scanning calorimetry/ thermogravimetry analyses coupled with mass spectrometry measurements. The phase compositions and chemical state of elements for the LiBH4/Al mixtures before and after hydrogen desorption and absorption reactions were assessed via powder x-ray diffraction, infrared spectroscopy, and x-ray photoelectron spectroscopy. Dehydrogenation results revealed that LiBH4 could react with Al to form AlB2and AlLi compounds with a two-step decomposition, resulting in improved dehydrogenation. The rehydrogenation experiments were investigated at 600° …
Ybco Films With Zr4+ Doping Grown By Mod Method, Min Liu, Hongli Suo, Shuai Ye, Dongqi Shi, Yue Zhao, Lin Ma, Meiling Zhou
Ybco Films With Zr4+ Doping Grown By Mod Method, Min Liu, Hongli Suo, Shuai Ye, Dongqi Shi, Yue Zhao, Lin Ma, Meiling Zhou
Australian Institute for Innovative Materials - Papers
YBa2Cu3O7-delta (YBCO) films with Zr doping have been prepared successfully by the trifluoroacetate metal-organic deposition (TFA-MOD) method through dissolving Zr acetylacetonate into the precursor solution. Yttria-stabilized zirconia(YSZ)nanoparticles were detected in the doped YBCO films by XRD. From the analysis of XRD omega and phi scans, the doped films have better out-of-plane and in-plane textures than those of the un-doped YBCO film. Although the doped YBCO films have lower T-c than that of the un-doped YBCO film, a very significant enhancement of normalized J(c) is displayed as compared to the undoped film at applied fields, indicating that an effective pinning force …
Ultrafast Interactions In Condensed Matter As Source Of Terahertz-Frequency Electromagnetic Radiation, Stuart Hargreaves, Roger A. Lewis
Ultrafast Interactions In Condensed Matter As Source Of Terahertz-Frequency Electromagnetic Radiation, Stuart Hargreaves, Roger A. Lewis
Australian Institute for Innovative Materials - Papers
Terahertz (THz, 1012 Hz) frequency radiation has long proven to be elusive relative to microwaves at lower frequenc ies and infrared radiation at higher frequencies. We have investigated several solid-state materials as candidate terahertz-frequency emitters under excitation by ultra-short (12 fs) pulses of near-infrared radiation, and present the results here with a comparison between different emission mechanisms.
The Emission Of Visible Radiation By Peeling Adhesive Tape, Evan Constable, Yunfei Hu, J. Horvat, Roger A. Lewis
The Emission Of Visible Radiation By Peeling Adhesive Tape, Evan Constable, Yunfei Hu, J. Horvat, Roger A. Lewis
Australian Institute for Innovative Materials - Papers
We have observed the emission of visible radiation on peeling adhesive tape from a spool. We have found that there is a fluctuation of light intensity in phase with the rotation of the spool from which the tape is being unwound. We have further found that the amount of light emitted initially increases as the unwinding speed is increased, then decreases at higher speeds.
Molecules With Multiple Personalities: How Switchable Materials Could Revolutionise Chemical Sensing, Fernando Benito-Lopez, R Byrne, Yizhen Wu, Lorrain Nolan, Jung Ho Kim, King Tong Lau, Gordon G. Wallace, Dermot Diamond
Molecules With Multiple Personalities: How Switchable Materials Could Revolutionise Chemical Sensing, Fernando Benito-Lopez, R Byrne, Yizhen Wu, Lorrain Nolan, Jung Ho Kim, King Tong Lau, Gordon G. Wallace, Dermot Diamond
Australian Institute for Innovative Materials - Papers
Worldwide, the demand for sensing devices that can conform with the requirements of large-scale wireless sensor network (WSN) deployments is rising exponentially. Typically, sensors should be very low cost, low power (essentially self-sustaining), yet very rugged and reliable. At present, functioning WSN deployments involve physical transducers only, such as thermistors, accelerometers, photodetectors, flow meters, to monitor quantities like temperature, movement, light level and liquid level/flow. Remote, widely distributed monitoring of molecular targets remains relatively unexplored, except in the case of targets that can be detected directly using 'non-contact' techniques like spectroscopy. This paper will address the issues inhibiting the close …
Investigation Of Thz Emission By P-Gaassb, Stuart Hargreaves, L J. Bignell, Roger A. Lewis, D Schoenherr, M Saglam, H L. Hartnagel
Investigation Of Thz Emission By P-Gaassb, Stuart Hargreaves, L J. Bignell, Roger A. Lewis, D Schoenherr, M Saglam, H L. Hartnagel
Australian Institute for Innovative Materials - Papers
With a suitable electric field imposed and under illumination by ultrashort pulses of near-infrared radiation, GaAsSb emits THz-frequency electromagnetic radiation. We conclude that high-temperature-grown GaAsSb is a new class of THz source.
Epithelial To Mesenchymal Transition And Breast Cancer, Eva Tomaskovic-Crook, Erik W. Thompson, Jean Paul Thiery
Epithelial To Mesenchymal Transition And Breast Cancer, Eva Tomaskovic-Crook, Erik W. Thompson, Jean Paul Thiery
Australian Institute for Innovative Materials - Papers
Epithelial-mesenchymal plasticity in breast carcinoma encompasses the phenotypic spectrum whereby epithelial carcinoma cells within a primary tumor acquire mesenchymal features and re-epithelialize to form a cohesive secondary mass at a metastatic site. Such plasticity has implications in progression of breast carcinoma to metastasis, and will likely influence response to therapy. The transcriptional and epigenetic regulation of molecular and cellular processes that underlie breast cancer and result in characteristic changes in cell behavior can be monitored using an increasing array of marker proteins. Amongst these markers exists the potential for emergent prognostic, predictive and therapeutic targeting.
Nano-Indentation Of Epoxy Hydro Gels For Soft Tissue Applications, Nandula D. Wanasekara, V. K. Vadlamani, Animesh Agrawal, Vijaya B. Chalivendra, Paul D. Calvert
Nano-Indentation Of Epoxy Hydro Gels For Soft Tissue Applications, Nandula D. Wanasekara, V. K. Vadlamani, Animesh Agrawal, Vijaya B. Chalivendra, Paul D. Calvert
Australian Institute for Innovative Materials - Papers
Nano-indentation characterization studies on epoxy hydro gels used for soft tissue applications are conducted using atomic force microscope (AFM). Two kinds of hydro gels: (a) plain epoxy hydro gels, and (b) epoxy hydro gels reinforced with three-dimensional polyurethane fiber pattern are considered in this study. The three-dimensional fiber pattern is generated using rapid robo-casting technique. Again these two hydro gel types are tested under five different conditions: (a) dry gel, (b) saturated with certain percentage of water, (c) saturated with 100% water, (d) 100% partially immersed in water, and (e) 100% fully immersed in water. Preliminary results obtained on plain …
Organic Bionics: Molecules, Materials And Medical Devices, Gordon G. Wallace, Simon E. Moulton
Organic Bionics: Molecules, Materials And Medical Devices, Gordon G. Wallace, Simon E. Moulton
Australian Institute for Innovative Materials - Papers
The uses of bionic devices that can improve the quality of human life are presented. Significant among them are the bionic ear or the bionic eye which has helped to regain use of important sensory organs. Bionics is the use of a biological entity and electronic devices that are put together to create the required implant.
Reduction Of Superconducting Transition Temperature And Flux Pinning In Al And C Codoped Mgb2 With Insight From First-Principles Calculations, Aihua Li, Xiaolin Wang, S X. Dou, Qiwen Yao, Zhenxiang Cheng, Saeid Soltanian, J M. Yoo, P Munroe
Reduction Of Superconducting Transition Temperature And Flux Pinning In Al And C Codoped Mgb2 With Insight From First-Principles Calculations, Aihua Li, Xiaolin Wang, S X. Dou, Qiwen Yao, Zhenxiang Cheng, Saeid Soltanian, J M. Yoo, P Munroe
Australian Institute for Innovative Materials - Papers
We report for the first time the Al and C codoping effect on the structures and superconductivity in MgB2. It was found that both the lattice parameters and the Tc decreased monotonically with increasing doping level of both Al and C. The Tc dropped to 27.5 and 7 K for x=0.2 and for x =0.4, respectively. The reduction of Tc for the codoping was found to be quicker than for individual Al doping and slower than for individual C doping at the same doping levels. First-principles calculations indicated that the observed decrease in Tc …
Antiferromagnetic Transition In Eufe2as2: A Possible Parent Compound For Superconductors, Zhi Ren, Zengwei Zhu, Shuai Jiang, Xiangfan Xu, Qian Tao, Cao Wang, Chunmu Feng, Guanghan Cao, Zhu An Xu
Antiferromagnetic Transition In Eufe2as2: A Possible Parent Compound For Superconductors, Zhi Ren, Zengwei Zhu, Shuai Jiang, Xiangfan Xu, Qian Tao, Cao Wang, Chunmu Feng, Guanghan Cao, Zhu An Xu
Australian Institute for Innovative Materials - Papers
Ternary iron arsenide EuFe2 As2 with ThCr2 Si2 -type structure has been studied by magnetic susceptibility, resistivity, thermopower, Hall, and specific-heat measurements. The compound undergoes two magnetic phase transitions at about 200 and 20 K, respectively. The former was found to be accompanied with a slight drop in magnetic susceptibility (after subtracting the Curie-Weiss paramagnetic contribution), a rapid decrease in resistivity, a large jump in thermopower, and a sharp peak in specific heat with decreasing temperature, all of which point to a spin-density-wave-like antiferromagnetic transition. The latter was proposed to be associated with an A -type antiferromagnetic ordering of Eu2+ …
Gel Sensors And Actuators, Paul Calvert
Gel Sensors And Actuators, Paul Calvert
Australian Institute for Innovative Materials - Papers
Gels, soft polymeric or composite materials that have a high fraction of water, are often found as structural materials and actuators in nature but have so far not found many uses when fabricated synthetically. We first examine some natural systems such as jellyfish, sea anemones, starfish, legumes, and human tissue, all having interesting ways of moving or otherwise reacting to the surrounding environment. Then we discuss swelling and cross-linking of hydrogels, followed by a look at actuation by electrically, thermally, and chemically stimulated gels, noting that electrical stimulation needs a chemical intermediary to show substantial actuation (comparable to human muscle, …
Influence Of Inductance Variation On Performance Of A Permanent Magnet Claw Pole Soft Magnetic Composite Motor, Youguang Guo, Jian Zhu, Zhi Lin, Haiyan Lu, Xiaolin Wang, Jiaxin Chen
Influence Of Inductance Variation On Performance Of A Permanent Magnet Claw Pole Soft Magnetic Composite Motor, Youguang Guo, Jian Zhu, Zhi Lin, Haiyan Lu, Xiaolin Wang, Jiaxin Chen
Australian Institute for Innovative Materials - Papers
Winding inductance is an important parameter in determining the performance of electrical machines, particularly those with large inductance variation. This paper investigates the influence of winding inductance variation on the performance of a three-phase three-stack claw pole permanent magnet motor with soft magnetic composite (SMC) stator by using an improved phase variable model. The winding inductances of the machine are computed by using a modified incremental energy method, based on three-dimensional nonlinear time-stepping magnetic field finite element analyses. The inductance computation and performance simulation are verified by the experimental results of an SMC claw pole motor prototype.
Enhancement Of Ferroelectricity And Ferromagnetism In Rare Earth Element Doped Bifeo3, Zhenxiang Cheng, Xiaolin Wang, S X. Dou, Hideo Kimura, Kiyoshi Ozawa
Enhancement Of Ferroelectricity And Ferromagnetism In Rare Earth Element Doped Bifeo3, Zhenxiang Cheng, Xiaolin Wang, S X. Dou, Hideo Kimura, Kiyoshi Ozawa
Australian Institute for Innovative Materials - Papers
Rare earth element doped BiFeO3 thin films were fabricated using the pulsed laser deposition method and various targets made from different starting Fe2O3 and Fe3O4 iron source materials. The films fabricated using the targets made from Fe3O4 exhibit great enhancement in their ferroelectricity, due to greatly reduced electrical leakage, as well as enhanced magnetization compared to those films deposited using targets from Fe2O3. It is suggested that the Fe2+ ion plays an important role in compensating for the charge imbalance and reducing current leakage, as …
Magnetic Anisotropy Of Naxcoo2 Single Crystals, Dapeng Chen, Xiaolin Wang, C T Lin, S X. Dou
Magnetic Anisotropy Of Naxcoo2 Single Crystals, Dapeng Chen, Xiaolin Wang, C T Lin, S X. Dou
Australian Institute for Innovative Materials - Papers
We report the magnetic properties of single crystals of NaxCoO2 (x=0.42, 0.82, and 0.87). The magnetic susceptibility measurements revealed considerable anisotropy along H parallel to ab and H parallel to c for the as-grown single crystals. It was found that an antiferromagnetic transition with a Neel temperature T-N=21 K occurred for the x=0.82 sample, and there was a paramagnetic phase for the x=0.87 sample over a wide temperature range from 2 to 300 K, but the sample with x=0.42 shows a monotonic increase of chi with increasing temperature above similar to 100 K. In addition, …
Proposal For A New Class Of Materials: Spin Gapless Semiconductors, Xiaolin Wang
Proposal For A New Class Of Materials: Spin Gapless Semiconductors, Xiaolin Wang
Australian Institute for Innovative Materials - Papers
The concept of the spin gapless semiconductor in which both electron and hole can be fully spin polarized is proposed, and its possibility is presented on the basis of first-principles electronic structure calculations. Possible new physics and potential applications in spintronic devices based on the spin gapless semiconductors are discussed.
Structure, Ferroelectric Properties, And Magnetic Properties Of The La-Doped Bismuth Ferrite, Zhenxiang Cheng, Aihua Li, Xiaolin Wang, S X. Dou, Kiyoshi Ozawa, Hideo Kimura, S Zhang, Thomas R. Shrout
Structure, Ferroelectric Properties, And Magnetic Properties Of The La-Doped Bismuth Ferrite, Zhenxiang Cheng, Aihua Li, Xiaolin Wang, S X. Dou, Kiyoshi Ozawa, Hideo Kimura, S Zhang, Thomas R. Shrout
Australian Institute for Innovative Materials - Papers
Bi1-xLaxFeO3 ceramics with x=0, 0.1, 0.2, and 0.3 have been synthesized by solid state reaction, starting from metal oxides. A series of structure transformations is found to depend upon the doping level. Below 10% La doping, Bi1-xLaxFeO3 maintains the rhombohedral structure of BiFeO3. However, for Bi0.8La0.2FeO3 and Bi0.7La0.3FeO3, the structures change to the orthorhombic and tetragonal, respectively. La doping significantly reduces electric leakage and leads to successful observation of electrical polarization hysteresis loops. Doping with La also …
La And Nb Codoped Bifeo3 Multiferroic Thin Films On Lanio3/Si And Iro2/Si Substrates, Zhenxiang Cheng, Xiaolin Wang, Hideo Kimura, Kiyoshi Ozawa, S X. Dou
La And Nb Codoped Bifeo3 Multiferroic Thin Films On Lanio3/Si And Iro2/Si Substrates, Zhenxiang Cheng, Xiaolin Wang, Hideo Kimura, Kiyoshi Ozawa, S X. Dou
Australian Institute for Innovative Materials - Papers
Nb and La codoped BiFeO3 thin films were fabricated on oxide bottom electrodes, LaNiO3/Si and IrO2/Si, by pulsed laser deposition method. The doped BiFeO3 thin film capacitor on LaNiO3showed a remnant polarization of more than 75 µC/cm2 in a saturated hysteresis loop. The same La and Nb codoped BiFeO3 thin film capacitors on IrO2 showed a larger remnant polarization, while with a significant contribution from the leakage current. Furthermore, the doped BiFeO3 capacitor on the LaNiO3 bottom electrode showed worse fatigue resistance than the film on IrO …
Excess Mg Addition Mgb2 /Fe Wires With Enhanced Critical Current Density, Rong Zeng, Lin Lu, Wenxian Li, Jianli Wang, Dongqi Shi, Josip Horvat, S X. Dou, M Bhatia, M D Sumption, Edward W. Collings, Jaimoo Yoo, Mike Tomsic, M Rindfleisch
Excess Mg Addition Mgb2 /Fe Wires With Enhanced Critical Current Density, Rong Zeng, Lin Lu, Wenxian Li, Jianli Wang, Dongqi Shi, Josip Horvat, S X. Dou, M Bhatia, M D Sumption, Edward W. Collings, Jaimoo Yoo, Mike Tomsic, M Rindfleisch
Australian Institute for Innovative Materials - Papers
MgB2 /Fe wires with 10 at. % excess Mg produced by in situ powder-in-tube processing werecompared to normal stoichiometric MgB2 /Fe wires prepared by the same method. It was found thatthe critical current density Jc and the irreversibility field (Hirr) were significantly enhanced forMgB2 /Fe wires with excess Mg. The transport Jc for 10 at. % Mg excess samples sintered at 800 degrees C, measured at a field of up to 14 T, increased by a factor of 2 compared to that for the normal MgB2 wires. The best Jc results …
Optical Property And Electronic Band Structure Of A Piezoelectric Compound Ga3po7 Studied By The First-Principles Calculation, Zhenxiang Cheng, Xiaolin Wang
Optical Property And Electronic Band Structure Of A Piezoelectric Compound Ga3po7 Studied By The First-Principles Calculation, Zhenxiang Cheng, Xiaolin Wang
Australian Institute for Innovative Materials - Papers
The structure, electronic and optical properties of a piezoelectric material, Ga3PO7 were studied by first-principles calculations in the framework of density functional theory. The calculated structure is in agreement with the experimental data. Band structure reveals that Ga3PO7 has a band gap of 3.69 eV. Analysis of partial density of states and Mulliken charge population indicates existence of GaO5 and PO4 anion groups in Ga3PO7. Furthermore, its optical properties, including dielectric constant, absorption, reflectivity, refractive index, and electron loss were calculated and analysed, which show that Ga3 …
Correlation Between Doping Induced Disorder And Superconducting Properties In Carbohydrate Doped Mgb2, Jung Ho Kim, S X. Dou, Sangjun Oh, M Jercinovic, E Babic, T Nakane, Hiroaki Kumakura
Correlation Between Doping Induced Disorder And Superconducting Properties In Carbohydrate Doped Mgb2, Jung Ho Kim, S X. Dou, Sangjun Oh, M Jercinovic, E Babic, T Nakane, Hiroaki Kumakura
Australian Institute for Innovative Materials - Papers
A comprehensive study of the effects of carbohydrate doping on the superconductivity of MgB2 has been conducted. In accordance with the dual reaction model, more carbon substitution is achieved at lower sintering temperature. As the sintering temperature is lowered, lattice disorder is increased. Disorder is an important factor determining the transition temperature for the samples studied in this work, as evidenced from the correlations among the lattice strain, the resistivity, and the transition temperature. It is further shown that the increased critical current density in the high field region can be understood by a recently-proposed percolation model [M. Eisterer …
Improved Ferroelectric Properties In Multiferroic Bifeo3 Thin Films Through La And Nb Codoping, Zhenxiang Cheng, Xiaolin Wang, S X. Dou, Hideo Kimura, Kiyoshi Ozawa
Improved Ferroelectric Properties In Multiferroic Bifeo3 Thin Films Through La And Nb Codoping, Zhenxiang Cheng, Xiaolin Wang, S X. Dou, Hideo Kimura, Kiyoshi Ozawa
Australian Institute for Innovative Materials - Papers
We report the significant improvement of the ferroelectric properties of BiFeO3thin film through control of electrical leakage by Nb doping. A very large remanent electrical polarization value of 80 µC/cm2 was observed in Bi0.8La0.2Nb0.01Fe0.99O3 thin film on Pt/Ti/SiO2/Si substrate. The doping effect of Nb in reducing the movable charge density due to oxygen vacancies in BiFeO3 was confirmed by the dielectric measurements. A very small loss was observed in the Nb and La codoped BiFeO3 thin film. As well as the improvement in the …