Abstract
        In this paper, the polycrystal defect spinel In21.333S32 (JCPDF No: 84-1385; Sys: Cubic; Lattice: Face-centered) was prepared 
utilizing the melt-slowly cooling method and its unpolarized and polarized Raman spectra together with the infrared 
transmission one were studied in detail. Based on microstructural features of defect spinel In21.333S32 (the random distribution 
of vacancies and indium atoms on tetrahedral sites as well as the strong distortion of octahedral sites) and the polarized 
spectroscopic characterization, the two strongest peaks at 305 cm-1 and 245 cm-1 were ascribed to the so-called clustering 
modes, i.e., the A1g symmetric stretching vibrating mode (ν1) of tetrahedral InS4 and octahedral InS6 respectively. In addition, 
the ascriptions of the distinct peaks or valleys on Raman and infrared spectra of defect spinel In21.333S32 were further 
proposed in this paper.
        Keywords
        Raman spectroscopy, Infrared spectroscopy, In2S3.
        Citation
        HAIZHENG TAO, HAOCHUN ZANG, GUOPING DONG, JIANMIN ZENG, XIUJIAN ZHAO, Raman and infrared spectroscopic study of the defect  spinel In21.333S32, Optoelectronics and Advanced Materials - Rapid Communications, 2, 6, June 2008, pp.356-359 (2008).
        Submitted at: April 29, 2008
 
        Accepted at: June 5, 2008