Ionic and electronic properties of oxo-vanadium arsenate and phosphate frameworks

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• 作者：Q. Yuan ; Y. Zhang ; S. Green ; E. Gihana ; V. Soghomonian ; ^{soghomon@vt.edu}
• 关键词：Electronic and ionic conductivity ; Structure ; Vanadium phosphate ; Vanadium arsenate
• 刊名：Inorganica Chimica Acta
• 出版年：2012
• 期刊代码：40_00201693
• 类别：ch
• 出版时间：1 July, 2012
• 卷：389
• 期：Complete
• 页码：202-206
• 文件大小：495 K

摘要

Electrically conducting zeolite-like frameworks are largely unstudied as electronic materials, but may offer new avenues in energy applications, ranging from electrical energy storage to catalysis. We present two zeolite-like framework materials, a vanadium arsenate [(As₆V₁₅O₅₁)^鈭?]_{鈭?/sub>, compound (1), and a vanadium phosphate [(P6V15O51)^鈭?]鈭?/sub>, compound (2), their syntheses, and physical and electrical characterization. We compare the electrical characteristics of the two compounds through the measurements of conductivity as a function of temperature and extra-framework constituents. Our results indicate that compound (1) is a mixed conductor with framework electronic conduction and ionic conduction associated with the extra-framework constituents. Compound (2), in contrast, shows only ionic conductivity. Probing the electronic properties of zeolite-like mixed conductors paves the way for the innovative use of these materials.}