个人简介

Sc.B., 1983, Brown University Ph.D., 1988, University of California at Berkeley Postdoctoral Fellow, 1988–1989, Northwestern University Camille and Henry Dreyfus New Faculty Award, 1989; Exxon Award in Solid State Chemistry, 1994; Guest Professor Shandong Normal University, 2001; Visiting Professor at the ICMCB-CNRS-Bordeaux, France, 2003; Visiting Professor Sun Yat-sen University, 2008; IPMI Henry J. Albert Award, 2009; Elected to the rank of Fellow of the AAAS, 2009; Visiting Scientist, NIMS, Tsukuba, Japan, 2010; South Carolina Section of the ACS “Outstanding Chemist 2010”; Associate Editor for Journal of Solid State Chemistry; Editor Journal of Alloys and Compounds; Elected to the rank of Fellow of the ACS, 2011; Associate Dean for Research for the College of Arts and Sciences; Southern Chemist Award, 2011; University of South Carolina Trustee Professorship Award, 2012; Vice-Chair, Solid State Chemistry Gordon Conference, 2014

研究领域

Inorganic

Research Areas: Inorganic materials chemistry; synthesis of novel solid state materials and characterization of their physical properties; investigation of cooperative structure-property relationships; crystal growth of complex oxides and investigation of their electronic and magnetic properties. Our research interests lie in the area of solid-state chemistry. The unifying theme in the research is the synthesis of novel solid-state materials and the correlation of structure with observed properties. For over 20 years we have worked on the development of high-temperature solution crystal growth techniques that enable us to prepare single crystals of novel complex oxides. We have built upon our success in the adaptation and exploration of crystal growth methods and have synthesized hundreds of new compositions. A current focus is to develop the methodology to grow larger than millimeter-sized crystals for single crystal neutron diffraction experiments at the Spallation Neutron Source at Oak Ridge National Laboratory. We use crystal growth methods in the majority of our research projects. Optical image of the red room temperature photoluminescence in EuKNaTaO5 We are developing new complex oxides in novel structure types that are highly luminescent and focus on complementary crystal growth approaches that are designed to create different classes of luminescent materials for solid-state lighting applications, including: a) the use of high temperature solutions to grow new complex rare earth containing oxides for solid state lighting and upconversion applications; b) the use of lower temperature hydrofluxes to create intrinsically luminescent oxides containing d0 transition elements and c) the use of fluxes stable under highly reducing conditions for the crystal growth of complex Eu2+ containing phosphors. These three approaches will permit the directed synthesis of oxides having specific mixed rare earth contents, and allow for the fine-tuning and synthetic control of their optical properties. We have pioneered a new research direction, the growth of complex uranium-containing oxide and fluoride crystals for fundamental and practical reasons. In general, we utilize two complementary approaches to achieve the synthesis of new complex uranium-containing oxides and fluorides based on 1) the synthesis of polycrystalline powders having compositions predicted by radius ratio rules and 2) a materials discovery approach based on crystal growth from high-temperature solutions. The synthesis of both- small, high-quality crystals containing U(VI), U(V) and U(IV) cations for structure analyses and large, high-quality crystals for use in oriented magnetic measurements and single crystal neutron diffraction experiments is on-going. Solid oxide fuel cells (SOFCs) offer the promise of significantly increased efficiency for power delivery. In order for these systems to become a reality, improved anode materials are essential. We are investigating perovskite-based oxides, such as Sr2Fe1.5Mo0.5O6-δ, which exhibit high ionic and electronic conductivty, and are studying their structures and compositions under actual fuel cell operating conditions. We utilize neutron diffraction data that we collect in-situ at ORNL’s Spallation Neutron Source to detect structural changes and to quantify the concentration of oxygen vacancies in these oxides. More recently we have started to explore new compositions that can cycle structurally between the perovskite and the K2NiF4 structure types and that can potentially be used in regenerative fuel cell systems. Finally we collaborate on the preparation of polymer nanocomposite materials. Specifically, we are focused on the synthesis of layered oxides with high dielectric constants for the preparation of polymer composite dielectric materials for pulse power applications. We have developed approaches for preparing nanocomposite materials with extremely high weight loadings of layered nanomaterials and are testing the effect of the layered materials on the overall performance of the nanocomposite, such as dielectric constant and dielectric loss, and are extensively characterizing the physical attributes of these composite systems. The underlying theme in all areas under investigation is the desire to understand how structure and composition affect properties, which will ultimately allow us to synthesize compounds with specific structures and, consequently, specific properties.

近期论文

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Read, C. M., Yeon, J., Smith, M. D., zur Loye, H.-C., “Crystal Growth, Structural Characterization, and Optical Properties of Uranium(VI) Containing Oxychlorides, A4U5O16Cl2 (A = K, Rb), Cs5U7O22Cl3, and AUO3Cl (A = Rb, Cs)”, Cryst. Eng. Comm., 2014, 16, 7259-7267. Suthirakun, S., Ammal, S., Munoz-Garcia, A., Xiao, G., Chen, F., zur Loye, H.-C., Carter, E., Heyden, A., “Theoretical Investigation of H2 Oxidation on the Sr2Fe1.5Mo0.5O6 (001) Perovskite Surface under Anodic Solid Oxide Fuel Cell Conditions”, J. Am. Chem. Soc., 2014, 136, 8374-8386. Yeon, J., Smith, M. D., Tapp, J., Möller, A., zur Loye, H.-C., “Mild Hydrothermal Crystal Growth, Structure, and Magnetic Properties of Ternary U(IV) Containing Fluorides; LiUF5, KU2F9, K7U6F31, RbUF5, RbU2F9, and RbF3F13”, Inorg. Chem., 2014, 53, 6289-6298. A.A. Aczel, P.J. Baker, D.E. Bugaris, J. Yeon, H.-C. zur Loye, T. Guidi, and D.T. Adroja “Exotic magnetism on the quasi-FCC lattices of the d3 double perovskites La2NaB′O6 (B′ = Ru, Os)” Phys. Rev. Lett., 2014, 112, 117603. Yeon, J., Smith, M. D., Tapp, J., Möller, A., zur Loye, H.-C., “Application of a Mild Hydrothermal Approach Containing an In Situ Reduction Step to the Growth of Single Crystals of the Quaternary U(IV)-containing Fluorides Na4MU6F30 (M = Mn2+, Co2+, Ni2+, Cu2+, and Zn2+) Crystal Growth, Structures, and Magnetic Properties”, J. Am. Chem. Soc., 2014, 136, 3955–3963. Bugaris, D. E., Hodges, J. P., Huq, A., Chance, W. M., Heyden, A., Chen, F., zur Loye, H.-C., “Investigation of the high-temperature redox chemistry of Sr2Fe1.5Mo0.5O6-8 via in situ neutron diffraction”, J. Mater. Chem. A., 2014, 2, 4045-4054. Chance, W. M., Bugaris, D. E., Sefat, A. S., zur Loye, H.-C., “Crystal Growth of New Hexahydroxometallates Using a Hydroflux”, Inorg. Chem., 2013, 52, 11723-11733. Yeon, J., Smith, M. D., Sefat, A. S., Tran, T. T., Halasyamani, P. S., zur Loye, H.-C., “U3F12(H2O), a Non-Centrosymmetric Uranium (IV) Fluoride Prepared via a Convenient In-situ Route that Creates U4+ under Mild Hydrothermal Conditions”, Inorg. Chem., 2013, 52, 8303–8305. Aczel, A. A., Bugaris, D. E., Yeon, J., de la Cruz, C., zur Loye, H.-C., Nagler, S. E., “Coupled Nd and B′ spin ordering in the double perovskites Nd2NaB′O6 (B′ = Ru, Os)”, Phys. Rev. B, 2013, 88, #014413. Yeon, J., Sefat, A. S., Tran, T. T., Halasyamani, P. S., zur Loye, H.-C., “Crystal Growth, Structure, Polarization and Magnetic Properties of Cesium Vanadate, Cs2V3O8: A Structure-Property Study”, Inorg. Chem., 2013, 52, 6179-6186. Bugaris, D. E., Smith, M. D., zur Loye, H.-C., “Hydroflux Crystal Growth of Platinum Group Metal Hydroxides: Sr6NaPd2(OH)17, Li2Pt(OH)6, Na2Pt(OH)6, Sr2Pt(OH)8, and Ba2Pt(OH)8”, Inorg. Chem., 2013, 52, 3836-3844. Yeon, J., Smith, M. C., Sefat, A. S., zur Loye, H.-C., “Crystal Growth, Structural Characterization, and Magnetic Properties of New Uranium(IV) Containing Mixed Metal Oxalates, Na2U2M(C2O4)6(H2O)4 (M = Mn2+, Fe2+, Co2+, and Zn2+)”, Inorg. Chem., 2013, 52, 2199-2207. Aczel, A. A., Bugaris, D. E., Li, L., Yan, J.-Q., de la Cruz, C., zur Loye, H.-C., Nagler, S. E., “Frustration by Competing Interactions in the Highly-distorted Double Perovskites La2NaB’O6 (B’ = Ru, Os)”, Phys. Rev. B., 2013, 87, #014435. Munoz-Garcia, A., Bugaris, D., Pavone, M., Hodges, J., Huq, A., Chen, F., zur Loye, H.-C., Carter, E., “Unveiling structure-property relationships in Sr2Fe1.5Mo0.5O6-δ, an electrode material for symmetric solid oxide fuel cells”, J. Am. Chem. Soc., 2012, 134, 6826-6833. Bugaris, D. E., zur Loye, H.-C., “Materials Discovery by Flux Crystal Growth: Quaternary and Higher Oxides”, Angew. Chem., Int. Ed., 2012, 51, 3780-3811. zur Loye, H.-C., Zhao, Q., Bugaris, D. E., Chance, W. M., “2H-Perovskite Related Oxides: Synthesis, Structures and Predictions”, Cryst. Eng. Comm., 2012, 14, 23-39.