KSi2P3: A new layered phosphidopolysilicate (IV)
Abstract
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) Å, b=10.1382(5) Å, c=21.1181(10) Å, β=96.88(0)°, and Z=8. In the structure, all SiP4 tetrahedra are connected with each other by corner-sharing P atoms to form [P3]-∞2 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.
- Publication:
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Journal of Solid State Chemistry France
- Pub Date:
- September 2013
- DOI:
- 10.1016/j.jssc.2013.07.018
- Bibcode:
- 2013JSSCh.205..129F