Ba3CuOs2O9 and Ba3ZnOs2O9, a comparative study
作者： Hai L. Feng , Martin Jansen
DOI: 10.1016/J.JSSC.2017.12.013
关键词: Crystal structure 、 Dimer 、 Octahedron 、 Coupling (physics) 、 Crystallography 、 Magnetic susceptibility 、 Crystallite 、 Osmium 、 Materials science 、 Ion
摘要: Abstract Polycrystalline samples of Ba3CuOs2O9 and Ba3ZnOs2O9 were synthesized by solid-state reactions. crystallizes in Cmcm, while adopts the hexagonal space group P63/mmc. Both crystal structures consist face-sharing Os-centered octahedra forming dimer-like Os2O9 units, which are interconnected corner-sharing CuO6, or ZnO6 octahedra, respectively. In Ba3CuOs2O9, CuO6 show a characteristic Jahn-Teller distortion. Both, Ba3ZnOs2O9, electrically insulating. Magnetic specific heat measurements confirm that is antiferromagnetically ordered below 47 K. Analysis magnetic data indicated its properties dominated Cu2+ ions. The susceptibility weakly temperature-dependent with broad maximum ≈ 280 K, indicating presence strong exchange interactions within dimer. residual at low temperatures also suggests appreciable coupling between dimers.
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