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Articles 25801 - 25830 of 34746

Full-Text Articles in Physical Sciences and Mathematics

Geostatistical And Stochastic Study Of Radio Nuclide Transport In The Unsaturated Zone At Yucca Mountain, Ming Ye, Amy J. Smiecinski, Raymond E. Keeler May 2006

Geostatistical And Stochastic Study Of Radio Nuclide Transport In The Unsaturated Zone At Yucca Mountain, Ming Ye, Amy J. Smiecinski, Raymond E. Keeler

Publications (YM)

The U.S. Nuclear Waste Technical Review Board [Cohon et al. 1998] evaluated the technical and scientific validity of activities undertaken by the Secretary of Energy to characterize Yucca Mountain, Nevada, for its suitability as an underground repository in which to store high-level radioactive waste and spent nuclear fuel. In the report, the Board pinpointed that the study on groundwater flow and radionuclide transport in the saturated and unsaturated zones below Yucca Mountain should, over the next several years, focus on reducing prediction uncertainty. In its 2002, the Board repeated this concern by stating, “… hydrogeologic processes that affect radionuclide transport …

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Molecular Dynamics Of Polystyrene Solutions In Microwave Fields, Mark J. Purdue, James M. D. Macelroy, D. F. O'Shea, Macduff O. Okuom, Frank D. Blum May 2006

Molecular Dynamics Of Polystyrene Solutions In Microwave Fields, Mark J. Purdue, James M. D. Macelroy, D. F. O'Shea, Macduff O. Okuom, Frank D. Blum

Chemistry Faculty Research & Creative Works

Equilibrium and nonequilibrium molecular dynamics simulation techniques were used to assess the influence of an applied microwave field on the dynamics of methylamine-methanol and methylamine-dimethylformamide (DMF) solutions bound within atactic polystyrene over a range of polymer densities from 35 to 96 wt % polymer. Atomistically detailed systems were studied, ranging from 3000 to 10 644 particles, using previously established potential models. Structural and dynamical properties were determined in the canonical (NVT) ensemble at 298 K. The simulated DMF self-diffusion coefficients in polystyrene solutions were compared with the zero-field experimental results established with pulsed-gradient spin-echo NMR spectrometry. A simulated external microwave …

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Studies By Biointeraction Chromatography Of Binding By Phenytoin Metabolites To Human Serum Albumin, Corey M. Ohnmacht, Shirley Chen, Zenghan Tong, David S. Hage May 2006

Studies By Biointeraction Chromatography Of Binding By Phenytoin Metabolites To Human Serum Albumin, Corey M. Ohnmacht, Shirley Chen, Zenghan Tong, David S. Hage

David Hage Publications

Biointeraction studies based on high performance affinity chromatography were used to investigate the binding of human serum albumin (HSA) to two major phenytoin metabolites: 5-(3-hydroxyphenyl)-5-phenylhydantoin (m-HPPH) and 5-(4-hydroxyphenyl)-5-phenylhydantoin (p-HPPH). This was initially examined by conducting self-competition zonal elution experiments in which m-HPPH or p-HPPH were placed in both the mobile phase and injected sample. It was found that each metabolite had a single major binding site on HSA. Competitive zonal elution experiments using l-tryptophan, warfarin, digitoxin, and cis-clomiphene as site-selective probes indicated that m-HPPH and p-HPPH were interacting with the indolebenzodiazepine …

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10,10′-Dinitro-10,10′-(Propane-1,3-Di­Yl)Di-10h-Anthracen-9-One, Mustafa Arslan, Erol Asker, John Masnovi, Ronald J. Baker May 2006

10,10′-Dinitro-10,10′-(Propane-1,3-Di­Yl)Di-10h-Anthracen-9-One, Mustafa Arslan, Erol Asker, John Masnovi, Ronald J. Baker

Chemistry Faculty Publications

The title compound, C31H22N2O6, was obtained as the decomposition product of (E,E)-1,3-bis­[9,10-dihydro-9-nitro-10-(trinitro­meth­yl)-9-anthr­yl]propane, which was synthesized via a photochemical reaction of 1,3-di-9-anthrylpropane with tetra­nitro­methane. Inter­molecular C—H⋯O inter­actions are the most prominent features of the crystal packing; no indications of any inter­molecular π–π stacking were found.

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An Investigation Into The Antifungal Activities Of N-Thiolated Beta- Lactams Against Selected Candida Species, Marci Culbreath May 2006

An Investigation Into The Antifungal Activities Of N-Thiolated Beta- Lactams Against Selected Candida Species, Marci Culbreath

USF Tampa Graduate Theses and Dissertations

β-lactam antibiotics have long been a reliable course of treatment for bacterial infections. However, with recent increases in resistance and rising populations of immunocompromised patients new β-lactams have been synthesized and tested. The Turos laboratory has recently discovered novel β-lactams that have a mode of action distinct from penicillin and other β-lactam antibiotics as cell lysis is not observed. In the current investigations, these compounds are shown to also have antifungal properties. The rising incidence and prevalence of invasive fungal infections has become an increasing concern. The most common fungal pathogens involved in these infections are species in the genus …

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Criticality Studies Of Dilute Plutonium Mixtures For Urex Processes, Denis Beller May 2006

Criticality Studies Of Dilute Plutonium Mixtures For Urex Processes, Denis Beller

Separations Campaign (TRP)

The completion of criticality experiments for mixtures of higher actinides (HA, includes neptunium, plutonium, americium, and curium) that will be created during the separation of used nuclear fuel has been identified as a requirement to construct prototype plants such as the Engineering-Scale Demonstration (ESD) and the Advanced Fuel Cycle Facility (AFCF) for the Global Nuclear Energy Partnership (GNEP). GNEP is a program to develop a worldwide consensus to enable the expanded use of economical, environmental nuclear energy to meet growing electricity demand. In this program and the Advanced Fuel Cycle R&D program (AFC) that supports it, we are developing economic …

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Synthesis And Characterization Of Regio-Interconvertible N-Tritylpyrrolidino Derivatives Of Sc3na@C80 Ihisomer, Ting Cai, Liaosa Xu, Mark Anderson, S. Carla, Alan Balch, Marilyn Olmstead, Harry Gibson, Harry Dorn May 2006

Synthesis And Characterization Of Regio-Interconvertible N-Tritylpyrrolidino Derivatives Of Sc3na@C80 Ihisomer, Ting Cai, Liaosa Xu, Mark Anderson, S. Carla, Alan Balch, Marilyn Olmstead, Harry Gibson, Harry Dorn

Mark R. Anderson

No abstract is currently available.

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Thermal Analysis Of Adsorbed Poly(Methyl Methacrylate) On Silica, Frank D. Blum, Erin N. Young, Gregory Smith, Oliver C. Sitton May 2006

Thermal Analysis Of Adsorbed Poly(Methyl Methacrylate) On Silica, Frank D. Blum, Erin N. Young, Gregory Smith, Oliver C. Sitton

Chemistry Faculty Research & Creative Works

Modulated differential scanning calorimetry has been used to quantify the glass transitions of small, adsorbed amounts of poly (methyl methacrylate) (PMMA) on silica. While a relatively narrow, single glass transition was found for bulk PMMA, broader two-component transitions were found for the adsorbed polymer. a two-state model based on loosely bound polymer (glass transition similar to bulk) and more tightly bound polymer (glass transition centered around 156°C) was used to interpret the thermograms. on the basis of this model, the amount of tightly bound polymer was found to be approximately 1.3 mg/m 2, corresponding to a 1.1 nm thick layer. …

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Single-Molecule Transistors: Electron Transfer In The Solid State, Douglas Natelson, Lam H. Yu, Jacob W. Ciszek, Zachary K. Keane, James M. Tour May 2006

Single-Molecule Transistors: Electron Transfer In The Solid State, Douglas Natelson, Lam H. Yu, Jacob W. Ciszek, Zachary K. Keane, James M. Tour

Chemistry: Faculty Publications and Other Works

Single-molecule transistors (SMTs) incorporating individual small molecules are unique tools for examining the fundamental physics and chemistry of electronic transport in molecular systems at the single nanometer scale. We describe the fabrication and characterization of such devices, and the synthesis and surface attachment chemistry of novel transition metal complexes that have been incorporated into such SMTs. We present gate-modulated inelastic electron tunneling vibrational spectroscopy of single molecules, strong Kondo physics (TK ∼ 75 K) as evidence of excellent molecule/electrode electronic coupling, and a demonstration that covalent attachment chemistry can produce SMTs that survive repeated thermal cycling to room …

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Site-Selective Reductive Desorption Used For Interfacial Patterning Of Substrates, Mark Anderson, David Roach May 2006

Site-Selective Reductive Desorption Used For Interfacial Patterning Of Substrates, Mark Anderson, David Roach

Mark R. Anderson

No abstract is currently available.

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An Electronic And Vibrational Study Of Sc3n@C68, Liaosa Xu, Ting Cai, Mark Anderson, Harry Dorn May 2006

An Electronic And Vibrational Study Of Sc3n@C68, Liaosa Xu, Ting Cai, Mark Anderson, Harry Dorn

Mark R. Anderson

No abstract is currently available.

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Ionic Self-Assembly Of An On-Column Enzyme Reactor For Capillary Separations: Detection Of Glucose And Glutamate, Stephanie Hooper, Mark Anderson May 2006

Ionic Self-Assembly Of An On-Column Enzyme Reactor For Capillary Separations: Detection Of Glucose And Glutamate, Stephanie Hooper, Mark Anderson

Mark R. Anderson

No abstract is currently available.

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Functional Replacement Of The Ketosynthase Domain Of Fum1 For The Biosynthesis Of Fumonisins, A Group Of Fungal Reduced Polyketides, Xiangcheng Zhu, Fengan Yu, R. S. Bojja, K. Zaleta-Rivera, Liangcheng Du May 2006

Functional Replacement Of The Ketosynthase Domain Of Fum1 For The Biosynthesis Of Fumonisins, A Group Of Fungal Reduced Polyketides, Xiangcheng Zhu, Fengan Yu, R. S. Bojja, K. Zaleta-Rivera, Liangcheng Du

Liangcheng Du Publications

The genetic manipulation of the biosynthesis of fungal reduced polyketides has been challenging due to the lack of knowledge on the biosynthetic mechanism, the difficulties in the detection of the acyclic, non-aromatic metabolites, and the complexity in genetically manipulating filamentous fungi. Fumonisins are a group of economically important mycotoxins that contaminate maize-based food and feed products worldwide. Fumonisins contain a linear dimethylated C18 chain that is synthesized by Fum1p, which is a single module polyketide synthase (PKS). Using a genetic system that allows the specific manipulation of PKS domains in filamentous fungus Fusarium verticillioides, we replaced the KS domain …

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The Role Of Specific Interactions On The Dispersion And Properties Of Carbon Nanotube-Polymer Nanocomposites, Asif Rasheed May 2006

The Role Of Specific Interactions On The Dispersion And Properties Of Carbon Nanotube-Polymer Nanocomposites, Asif Rasheed

Doctoral Dissertations

This dissertation presents work that exammes the role of specific chemical interactions in enhancing the dispersion of carbon nanotubes in a polymer matrix. Carbon nanotubes (CNT) possess unique mechanical, electrical and thermal properties hence can have a number of potential applications including high strength, light weight composites. Due to strong interaction among nanotubes, they stay as aggregates and hence their full potential for application is severely limited. Utilization of specific chemical interactions to induce/improve miscibility in polymer blends is well known. In this thesis, this approach is applied to carbon nanotubes polymer composites to enhance the dispersion of nanotubes in …

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Spectroscopic Investigations In Chiral Crystalline And Solution Phases, Andrew Thomas Fischer May 2006

Spectroscopic Investigations In Chiral Crystalline And Solution Phases, Andrew Thomas Fischer

Doctoral Dissertations

Chirality is an interesting phenomenon that is not completely understood, and the present work broadens the present body of knowledge using various methods. Crystallization experiments of glycine have confirmed the previously reported phenomenon of nonphotochemical laser induced nucleation (NPLIN), and experiments utilizing a geometry with focused lasers may also display NPLIN, though the results indicate that new factors such as pH of the irradiated solution may affect the crystallizing process. Sodium bromate, NaBrO3, may also crystallize via NPLIN, though the results are not as conclusive as the glycine experiments. For both glycine and sodium bromate, sound waves produced …

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Search For Global-Minimum Geometries Of Medium-Sized Germanium Clusters. Ii. Motif-Based Low-Lying Clusters Ge21–Ge29, S. Yoo, Xiao Cheng Zeng May 2006

Search For Global-Minimum Geometries Of Medium-Sized Germanium Clusters. Ii. Motif-Based Low-Lying Clusters Ge21–Ge29, S. Yoo, Xiao Cheng Zeng

Xiao Cheng Zeng Publications

We performed a constrained search for the geometries of low-lying neutral germanium clusters GeN in the size range of 21≤N≤29. The basin-hopping global optimization method is employed for the search. The potential-energy surface is computed based on the plane-wave pseudopotential density functional theory. A new series of low-lying clusters is found on the basis of several generic structural motifs identified previously for silicon clusters [S. Yoo and X. C. Zeng, J. Chem. Phys. 124, 054304 (2006)] as well as for smaller-sized germanium clusters [S. Bulusu et al., J. Chem. Phys. 122, 164305 (2005)]. Among the generic motifs examined, …

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Selective Catalytic Oxidation Of Hydrogen Sulfide For Cleanup Of Claus Tail Gases: Startup Of Industrial Installation At Omsk Refinery, Andrey N. Zagoruiko, Vladimir V. Mokrinskii, Nataly A. Chumakova, Galina A. Bukhtiarova, Sergey V. Vanag, Tatiana V. Borisova, Galina G. Isaeva, Boris G. Kozorog May 2006

Selective Catalytic Oxidation Of Hydrogen Sulfide For Cleanup Of Claus Tail Gases: Startup Of Industrial Installation At Omsk Refinery, Andrey N. Zagoruiko, Vladimir V. Mokrinskii, Nataly A. Chumakova, Galina A. Bukhtiarova, Sergey V. Vanag, Tatiana V. Borisova, Galina G. Isaeva, Boris G. Kozorog

Andrey N Zagoruiko

The presentation describes the experience of development and commercialization of the catalyst and the process for selective oxidation of H2S into sulfur, which was put into industrial operation at Omsk Refinery (Omsk, Russia) in 2004.

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Ionic Liquids In Analytical Chemistry, Jared L. Anderson, Daniel W. Armstrong, Guor-Tzo Wei May 2006

Ionic Liquids In Analytical Chemistry, Jared L. Anderson, Daniel W. Armstrong, Guor-Tzo Wei

Jared L. Anderson

Room-temperature ionic liquids (RTILs), also known as liquid organic, molten, or fused salts, are a class of nonmolecular ionic solvents with low melting points. The accepted definition of an RTIL is any salt that has a melting point lower than ambient temperature (1). However, “ionic liquid” (IL) is often applied to any compound that has a melting point <100 °C. Most common RTILs are composed of unsymmetrically substituted nitrogen-containing cations (e.g., imidazole, pyrrolidine, pyridine) with inorganic anions (e.g., Cl–, PF6 –, BF4 –). ILs are also interesting because of their other useful and intriguing physicochemical properties. Wilkes et al. first reported ambient-temperature ILs based on the 1-alkyl-3-methylimidazolium cation in 1982 (2). Since then, many ILs containing a variety of cations and anions of different sizes have been synthesized to provide specific characteristics.

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Distinct Glycan Structures Of Uroplakins Ia And Ib, Bo Xie, Ge Zhou, Shiu-Yung Chan, Ellen Shapiro, Xiant-Peng Kong, Xue-Ru Wu, Tung-Tien Sun, Catherine E. Costello May 2006

Distinct Glycan Structures Of Uroplakins Ia And Ib, Bo Xie, Ge Zhou, Shiu-Yung Chan, Ellen Shapiro, Xiant-Peng Kong, Xue-Ru Wu, Tung-Tien Sun, Catherine E. Costello

Bo Xie

Although it has been shown that mouse uroplakin (UP) Ia, a major glycoprotein of urothelial apical surface, can serve as the receptor for the FimH lectin adhesin of type 1-fimbriated Escherichia coli, the organism that causes a great majority of urinary tract infections, the glycan structure of this native receptor was unknown. Using a sensitive approach that combines in-gel glycosidase and protease digestions, permethylation of released glycans, and mass spectrometry, we have elucidated for the first time the native glycoform structures of the mouse UPIa receptor and those of its non-binding homolog, UPIb, and have determined the glycosylation site occupancy. …

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In Situ Sum Frequency Generation Vibrational Spectroscopy Observation Of A Reactive Surface Intermediate During High-Pressure Benzene Hydrogenation, Kaitlin M. Bratlie, Lucio D. Flores, Gabor A. Somorjai May 2006

In Situ Sum Frequency Generation Vibrational Spectroscopy Observation Of A Reactive Surface Intermediate During High-Pressure Benzene Hydrogenation, Kaitlin M. Bratlie, Lucio D. Flores, Gabor A. Somorjai

Kaitlin M. Bratlie

Sum frequency generation surface vibrational spectroscopy and kinetic measurements using gas chromatography have been used to identify a reactive surface intermediate in situ during hydrogenation of benzene on a Pt(111) single crystal surface at Torr pressures. Upon adsorption at 310 K, both chemisorbed and physisorbed benzene coexist on the surface, a result which has not previously been observed. Kinetic measurements show a linear compensation effect for the production of both cyclohexane and cyclohexene. From these data the isokinetic temperature was identified and correlated to the chemisorbed benzene species, which were probed by means of vibrational spectroscopy. Additionally, chemisorbed benzene was …

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A Comparison Of The Imapct Of Environmental Stressors On Blood Parameters Of Captive Harbor Seals (Phoca Vitulina), Maura Allard May 2006

A Comparison Of The Imapct Of Environmental Stressors On Blood Parameters Of Captive Harbor Seals (Phoca Vitulina), Maura Allard

Senior Honors Projects

Little research has been established in determining blood chemistry values for harbor seals in Alaska. It has been suggested that various environmental factors can influence the blood chemistry values due to temperature, day length, precipitation, constraint and diet amongst other variables. Currently there are no guidelines for veterinarians and rehabilitators to refer to when analyzing blood chemistry values for sick animals. The hope for this research is that it will aide in establishing guidelines for specific circumstances due to environmental stressors. It is hoped that in the future, this study will be used to create values for which veterinarians can …

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Optimization Of A Ribosomal Structural Domain By Natural Selection, Corina Maeder, G. L. Conn, D. E. Draper May 2006

Optimization Of A Ribosomal Structural Domain By Natural Selection, Corina Maeder, G. L. Conn, D. E. Draper

Chemistry Faculty Research

A conserved, independently folding domain in the large ribosomal subunit consists of 58 nt of rRNA and a single protein, L11. The tertiary structure of an rRNA fragment carrying the Escherichia coli sequence is marginally stable in vitro but can be substantially stabilized by mutations found in other organisms. To distinguish between possible reasons why natural selection has not evolved a more stable rRNA structure in E. coli, mutations affecting the rRNA tertiary structure were assessed for their in vitro effects on rRNA stability and L11 affinity (in the context of an rRNA fragment) or in vivo effects on cell …

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Programs To Compute Distribution Functions And Critical Values For Extreme Value Ratios For Outlier Detection, George Mcbane May 2006

Programs To Compute Distribution Functions And Critical Values For Extreme Value Ratios For Outlier Detection, George Mcbane

Peer Reviewed Articles

A set of FORTRAN subprograms is presented to compute density and cumulative distribution functions and critical values for the range ratio statistics of Dixon (1951, The Annals of Mathematical Statistics) These statistics are useful for detection of outliers in small samples

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Muon-Spin Relaxation Study Of The Spin-(1)(2) Molecular Chain Compound Cu(Hco2)(2)(C4h4n2), T Lancaster, S J. Blundell, M L. Brooks, P J. Baker, F L. Pratt, Jamie L. Manson, C Baines May 2006

Muon-Spin Relaxation Study Of The Spin-(1)(2) Molecular Chain Compound Cu(Hco2)(2)(C4h4n2), T Lancaster, S J. Blundell, M L. Brooks, P J. Baker, F L. Pratt, Jamie L. Manson, C Baines

Chemistry and Biochemistry Faculty Publications

We present the results of a muon-spin relaxation (mu+SR) study of magnetic order in the quasi-one-dimensional spin-1/2 molecular chain compound Cu(HCO2)(2)(C4H4N2). Zero-field mu+SR measurements at low temperatures show oscillations in the measured asymmetry, characteristic of a quasistatic magnetic field at the muon sites. Our measurements provide convincing evidence for long-range magnetic order below a temperature T-N=1.97(8) K. This leads to an estimate of the interchain coupling constant of parallel to J'parallel to/k(B)=1.27 K and to a ratio parallel to J'/J parallel to=1.6x10(-1).

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Oxidative Damage Caused By Iron Loading Into Ferritin, Talina Christensen Watts May 2006

Oxidative Damage Caused By Iron Loading Into Ferritin, Talina Christensen Watts

Undergraduate Honors Capstone Projects

Ferritin is the iron storage protein found in humans, animals, plants, fungi and bacteria. We are interested in how iron is loaded and stored in mammalian ferritin. Ferrous iron must be oxidized to ferric iron in order to be stored in ferritin. It is generally believed that ferritin does the loading itself, dependant upon a "ferroxidase activity." Oxidation of iron can result in the production of the hydroxyl radical which can cause oxidative damage to surrounding proteins and other biomolecules. An indicator of oxidative damage to proteins is the formation of carbonyl groups. Using only the H subunit of human …

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Numerical Aspects Of The Saft Equation Of State, Leah M. Octavio May 2006

Numerical Aspects Of The Saft Equation Of State, Leah M. Octavio

Senior Honors Projects

Equations of states are used to model fluid behavior. At a given temperature and pressure, for example, a mixture of water and alcohol might form a liquid and vapor phase, with the vapor phase being richer in alcohol and the liquid phase richer in water. In many industrial processes, such as distillation or extraction where mixtures of different compounds need to be separated, knowing how the fluid mixture will behave at various conditions helps make the operations more efficient and economical. While many equations of state exist, they differ in their accuracy in modeling systems and in their mathematical complexity. …

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Toward Synthesizing A Selective Dopamine Binding Magnetic Resonance Contrast Agent, Judy Lau May 2006

Toward Synthesizing A Selective Dopamine Binding Magnetic Resonance Contrast Agent, Judy Lau

Senior Honors Projects

Magnetic resonance imaging (MRI) is a non-invasive diagnostic methodology used to provide a two-dimensional view of an internal organ or structure, especially the brain and spinal cord. Magnetic resonance contrast agents are usually injected into necessary parts of the body prior to imaging to increase the differences between different tissues or between normal and abnormal tissue, making it easier for a radiologist or doctor to interpret the image that is taken. The development of new and more efficient, effective, and selective contrast agents for various biological processes or chemicals is a growing field of research and study. My project allowed …

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Copper(I) Chloride Carbonyl Polymers, Austin B. Wiles, Robert D. Pike May 2006

Copper(I) Chloride Carbonyl Polymers, Austin B. Wiles, Robert D. Pike

Arts & Sciences Articles

Addition of bridging diamine ligands to methanolic solutions of CuCl under a CO purge produces the polymeric complexes [(CuCl)2(CO)2(biL)] (biL = diazabicyclo[2.2.2]octane (DABCO), piperazine (Pip), N,N‘-dimethylpiperazine (DMP)). X-ray crystal structures of the three complexes reveal rhombic OC−Cu(μ-Cl)2Cu−CO bridged by biL. Unsaturated bridging ligands fail to produce carbonyl-bearing products.

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Secondary N-Nitrosocarbamate Anions: Structure And Alkylation Reactions. A Dft Study, Vladimir Benin May 2006

Secondary N-Nitrosocarbamate Anions: Structure And Alkylation Reactions. A Dft Study, Vladimir Benin

Chemistry Faculty Publications

The current article reports theoretical studies (DFT: B3LYP/6-31+G(d)) on the structure and alkylation reactions of the anions of some secondary N-nitrosocarbamates, a class of ambident nucleophiles whose chemistry has been little explored. Several anions (1–4), with an increasing size of the carbamate alkyl (aryl) group were investigated, in an attempt to establish the influence of the size of that group on the thermal stability and regioselectivity of alkylation of the title anions. The conclusion is that thermal stability and the mode of reaction are affected significantly only in the presence of very large and branched carbamate groups. The thermal …

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Magnetic And Electronic Properties Of Eu₄Sr₄Ga₁₆Ge₃₀, Gerald T. Woods, Joshua B. Martin, Matthew Beekman, Raphäel P. Hermann, Fernande Grandjean, Veerle M. Keppens, Olaf Leupold, Gary J. Long, George S. Nolas May 2006

Magnetic And Electronic Properties Of Eu₄Sr₄Ga₁₆Ge₃₀, Gerald T. Woods, Joshua B. Martin, Matthew Beekman, Raphäel P. Hermann, Fernande Grandjean, Veerle M. Keppens, Olaf Leupold, Gary J. Long, George S. Nolas

Chemistry Faculty Research & Creative Works

Magnetization, static and ac magnetic susceptibility, nuclear forward scattering, and electrical resistivity measurements have been performed on polycrystalline Eu4Sr4Ga16Ge30, a type I clathrate that has divalent strontium and europium ions encapsulated within a Ga-Ge framework. These data are compared with those of type I clathrates Eu8Ga16Ge30 and Eu6Sr2Ga16Ge30. The ferromagnetic ordering of these Eu-containing clathrates is substantially altered by the incorporation of strontium, as compared to Eu8Ga16Ge30. Ferromagnetism, accompanied by a relatively large …

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