KSi₂P₃: A new layered phosphidopolysilicate (IV)

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• 作者：Kai Feng ; Lei Kang ; Wenlong Yin ; Wenyu Hao ; Zheshuai Lin ; Jiyong Yao ; Yicheng Wu
• 关键词：KSi2P3 ; Synthesis ; Crystal structure ; Optical properties
• 刊名：Journal of Solid State Chemistry
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：205
• 期：Complete
• 页码：129-133
• 全文大小：2293 K

文摘

A new ternary phosphidopolysilicate (IV), KSi₂P₃, has been synthesized by high temperature solid state reaction. The compound crystallizes in a new structure type in the monoclinic space group C2/c with a=10.1327(5) ?, b=10.1382(5) ?, c=21.1181(10) ?, ¦Â=96.88(0)¡ã, and Z=8. In the structure, all SiP₄ tetrahedra are connected with each other by corner-sharing P atoms to form layers, which are stacked along c direction and separated by K⁺ cations. The two-dimensional structure of KSi₂P₃ contrasts with those of the two known members in the ternary A/Si/P (A=alkali metal) system, namely Na₅SiP₃ (zero-dimensional) and K₂SiP₂ (one-dimensional), which contains less amount of Si. The band gap deduced from UV-vis-IR diffuse reflectance spectrum is 1.72 eV.