Synthesis and characterization of manganese- and copper-based arsenate and silicate compounds with open-framework structures

[摘要] Several arsenate and silicate compounds with interesting structural features have been synthesized by the molten salt flux method. These new materials were characterized by single crystal and powder X-ray diffraction, infrared spectroscopy, magnetic susceptibility, and elemental analysis.The compounds generally have an open-framework structural network, although some also exhibit layer-like or quasi-low-dimensional features. In the arsenate family of compounds, two copper arsenates, BaCuAs$sb2$O$sb7$ and $m Nasb7Cusb4(AsOsb4)sb5,$ as well as two isomorphous manganese arsenates, NaMn$sb4$(AsO$sb4)sb3$ and KMn$sb4$(AsO$sb4)sb3,$ were synthesized and characterized. In the silicate system, two isostructural copper silicate chlorides, $m Nasb2Rbsb2Cusb4Sisb{12}Osb{29}Clsb2$ and $m Nasb2Cssb2Cusb4Sisb{12}Osb{29}Clsb2,$ were successfully identified.Our study of structure/property correlations should prove insightful toward a better understanding of the conducting mechanism in technologically important metallic/magnetic oxides and in the development of new materials with desired applications.

[发布机构] Rice University

[效力级别] chemistry