Structure and Physical Properties of the Polar Oxysulfide CaZnOS
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- 作者：Timothy Sambrook ; Catherine F. Smura ; Simon J. Clarke ; Kang Min Ok ; P. Shiv Halasyamani
- 刊名：Inorganic Chemistry
- 出版年：2007
- 出版时间：April 2, 2007
- 年：2007
- 卷：46
- 期：7
- 页码：2571 - 2574
- 全文大小：98K
- 年卷期：v.46,no.7(April 2, 2007)
- ISSN：1520-510X
文摘
The synthesis, structure, and electrical properties of the oxysulfide CaZnOS are reported. The white compoundhas a band gap of 3.7(1) eV and crystallizes in hexagonal space group P63mc (No. 186) with a = 3.75726(3) Å,c = 11.4013(1) Å, and Z = 2. The noncentrosymmetric structure, which has few analogues, is composed ofisotypic puckered hexagonal ZnS and CaO layers arranged so that ZnS3O tetrahedra are all aligned parallel,resulting in a polar structure. The compound shows type 1 non-phase-matchable second harmonic generation,determined using 1064 nm radiation, with an efficiency approximately 100 times that of 
fchars/alpha.gif" BORDER=0>-SiO2 and a piezoelectriccoefficient of 38 pm V-1. Although polar, CaZnOS is not ferroelectric and the pyroelectric coefficient is very small,approximately 0.0 
f">C m-2 K-1 between room temperature and 100 
f">C.
fchars/alpha.gif" BORDER=0>-SiO2 and a piezoelectriccoefficient of 38 pm V-1. Although polar, CaZnOS is not ferroelectric and the pyroelectric coefficient is very small,approximately 0.0 f">C m-2 K-1 between room temperature and 100 f">C.