Moeller, Angela - University of Houston

个人简介

Apl.-Professor, Universität zu Köln, 2007 Privat-Dozentin, Universität zu Köln, 2002 Lecturer, Universität Hannover, 1995 Post-doctoral fellowship, 1993-1995

研究领域

Synthesis, Crystals Structures and Properties of Oxides with Unusual Structural Features New synthetic solid state strategies for very air-sensitive, alkaline-rich transition metallates have enabled us to access unprecedented low coordination numbers (e.g. C.N. 2 and 3) as well as low oxidation states of the transition metals. •Na5[MO2][CO3] with M = CoI, NiI, CuI in a two-fold coordination and non-coordinating complex anions (CO32-), are examples of single square-lattices of magnetic ions. Our recent activities have been on spectroscopic characterization which leads to new insights into the lattice dynamics and electronic structures of the complex transition metals in low oxidation states in “unsaturated” low coordination; •Na10[Mn3O6][MnO3]: Experimental realization of the (frustrated) star-lattice in magnetic oxides. Unprecedented low C.N.(Mn-O) of 3 for manganese(II) in oxides; •Na2ReO3: First structural confirmation of a Re-Re triple bond in oxides with an exceptionally low C.N.(Re-O) 3; •Na26Mn39O55 The first T5 super-tetrahedron in oxide chemistry; Reactivity of Solids Ongoing research includes investigations related to the reactivity of solids. Of particular interest to us are classical solid state reactions (diffusion mechanisms) at lower temperatures, and redox reactions of in-situ activated oxides, e.g. ternary or polynary alkaline metal-rich oxides. A rather rare example for a syn-proportionation sublimation (chemical vapor transport mechanism and thermodynamic data) of In2O3 activated by manganese has been studied in detail. Currently, we are expanding our efforts of crystal growth into ionic flux methods, hydrothermal techniques or enhancements via slight vapor pressure of less ionic fluxes. Structure-Property Relationships in Strongly Correlated Oxides The focus of our research includes the synthesis and structural characterization of new compounds and addresses the inherent physical properties to achieve a more fundamental understanding of the mechanisms at work. Therefore, specifically selected compounds are investigated. In recent years, we have studied various phenomena related to dominantly low-dimensional magnetic interactions by several experimental techniques and combined our results in strong collaboration with experimental and theoretical physicists. Accomplishments are related to the interdisciplinary fields of synthesis, structural aspects, thermodynamic and transport properties, magnetism, spectroscopy, and diffraction techniques: •AgCuVO4: quasi one-dimensional S = ½ Heisenberg system, impact of frustrated inter-chain coupling on the ordering temperature; •In2VO5: S = ½ zigzag chain with intra-chain frustration; •TiOCl: Spin-Peierls material, magnetic properties, spectroscopy and pressure dependence; •Magnetic nanoscale domains on the honeycomb lattice and finite size effects in InCu2/3V1/3O3; •(Sr, Ba)Ag2M[VO4] with MII = Co, Ni, Cu: a new class of ferromagnetic insulators; •Tuning superexchange couplings via non-magnetic complex ions on a triangular lattice of magnetic ions: dependence on structural distortions and the spin system.

近期论文

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J. Yeon, M. Smith, J. Tapp, A. Möller, H.-C. zur Loye*; 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. Amer. Chem. Soc., 136, 3955 (2014). M. Bratsch, A.P. Litvinchuk, J. Tapp, A. Möller*; Synthesis, Thermodynamic and Spectroscopic Properties of Honeycomb-Type Lattices: AAg2(M’1/3M2/3)[VO4]2; Inorg. Chem. (2014), DOI: 10.1021/ic500028b. P. Samarasekere, X. Wang, A.J. Jacobson*, J. Tapp, A. Möller*; Synthesis, Crystal structures, Magnetic, and Thermal Properties of Divalent Metal Formate – Formamide Layered Compounds, Inorg. Chem. (2014), 53, 244. V. Gnezdilov, P. Lemmens, D. Wulferding, A. Möller, P. Recher, H. Berger, R. Sankar, F. C. Chou, Enhanced quasiparticle dynamics of quantum well states: the giant Rashba system BiTeI and topological insulators, Phys. Rev. B (2014), accepted, arXiv:1303.4333. D.Wulferding, A. Möller, K.-Y. Choi, Y. G.Pashkevich, R. Y. Babkin, K. V. Lamonova, P. Lemmens, J. M. Law, R. K. Kremer, R. Glaum, Lattice and orbital fluctuations in TiPO4, Phys. Rev B 88, 205136 (2013). Q. Gao, X. Wang, J. Tapp, A. Möller, A.J. Jacobson*, Antimony Tartrate Transition-Metal−Oxo Chiral Clusters, Inorg. Chem. 52, 6610 (2013). A.P. Litvinchuk*, A. Möller, L Debbichi, P Krüger, M.N. Iliev, M.M. Gospodinov; The Second-Order Raman Scattering in CuO, J. Phys. Cond. Matter, 25, 105402 (2013). P.D. Doan, M. Gooch, Z. Tang, B. Lorenz, A. Möller, J. Trapp, P.C.W. Chu, A.M. Guloy*; Ba1-xNaxTi2Sb2O (0.0 x 0.33): A Layered Titanium-based Pnictide Oxide Superconductor, J. Amer. Chem. Soc., 134, 16520, (2012). D.E. Gheorghe, A.P. Litvinchuk, A. Möller*; Electronic Excitations and Lattice Dynamics of Coordinatively ""Unsaturated"" Complex Transition Metal Compounds, Inorg. Chem. 51, 5822 (2012). D.E. Gheorghe, A.P. Litvinchuk, A. Möller*; Crystal Structure and Vibrational Properties of a Sodium Oxoferrate(II) Hydroxide, Na5[FeO3][OH], Z. Anorg. Allg. Chem., 638, 2087, (2012), Invited - Special Issue. A. Möller*, N.E. Amuneke, P. Daniel, B. Lorenz, C.R. de la Cruz, M. Gooch, P.C.W. Chu; AAg2M[VO4]2 with A = Ba, Sr and M = Co, Ni: a series of ferromagnetic insulators, Phys. Rev. B, 85, 214422 (2012). A.A. Tsirlin*, A. Möller*, B. Lorenz, Y. Skourski, H. Rosner; Superposition of ferromagnetic and antiferromagnetic spin chains in the quantum magnet BaAg2Cu[VO4]2, Phys. Rev. B 85, 014401 (2012). M.M. Kremlev, A.I. Mushta, W. Tyrra*, Y.L. Yagupolskii, D. Naumann, A. Möller; Me3SiCF3/AgF/Cu - a new reagents combination for selective trifluoromethylation of various organic halides by trifluoromethylcopper, CuCF3, J. Fluorine Chem. 133, 67 (2012). (Special Issue) N.E. Amuneke, D.E. Gheorghe, B. Lorenz, A. Möller*; Synthesis, crystal structure, and physical properties of BaAg2Cu[VO4]2: A New Member of the S = ½ Triangular Lattice, Inorg. Chem. 50, 2207 (2011). M. Yehia, E. Vavilova, A. Möller, T. Taetz, U. Löw, R. Klingeler, V. Kataev*, B. Büchner; Finite size effects and magnetic order in the spin-½ honeycomb lattice compound InCu2/3V1/3O3, Phys. Rev. B 81, 060414(R) (2010). A. Möller*, M. Schmitt, W. Schnelle, T. Förster, H. Rosner*; AgCuVO4: a quasi one-dimensional S = ½ chain compound, Phys. Rev. B 80, 125106 (2009).