Comparison of the Vibrational Spectra of Copper Polysilicate, CuSiO₃, with Those of the Prototypic Copper Polygermanate, CuGeO₃  

作　　者：Marco Meibohm Hans Hermann Otto 

机构地区：[1]Materials Science and Crystallography, Technical University of Clausthal, Clausthal-Zellerfeld, Lower Saxony, Germany

出　　处：《American Journal of Analytical Chemistry》2018年第6期311-321,共11页美国分析化学（英文）

摘　　要：Orthorhombic copper polysilicate, CuSiO3, is isotypic to the spin-Peierls compound CuGeO3 and represents a further example of a quasi-one-dimensional spin = 1/2 antiferromagnetic Heisenberg chain system. This is a representation of the first Raman and IR/FIR spectra for CuSiO3, measured at room temperature on polycrystalline samples. A comparison of the optical phonons, predicted by a factor group analysis, with those observed for the CuGeO3 prototype, is presented. A mode assignment for the silicate is given. Surface effects due to a very small crystallite size may cause additional broad bands observed in the Raman spectrum of CuSiO3. From the analysis of the Davydov doublet an intralayer-to-interlayer bond strength of about 40 is derived for the silicate, which is about 20% lower than for the isotypic germanate, allowing for different magnetic responses at low temperature.Orthorhombic copper polysilicate, CuSiO3, is isotypic to the spin-Peierls compound CuGeO3 and represents a further example of a quasi-one-dimensional spin = 1/2 antiferromagnetic Heisenberg chain system. This is a representation of the first Raman and IR/FIR spectra for CuSiO3, measured at room temperature on polycrystalline samples. A comparison of the optical phonons, predicted by a factor group analysis, with those observed for the CuGeO3 prototype, is presented. A mode assignment for the silicate is given. Surface effects due to a very small crystallite size may cause additional broad bands observed in the Raman spectrum of CuSiO3. From the analysis of the Davydov doublet an intralayer-to-interlayer bond strength of about 40 is derived for the silicate, which is about 20% lower than for the isotypic germanate, allowing for different magnetic responses at low temperature.

关 键 词：IR/FIR SPECTRA Raman SPECTRA Factor Group Analysis Davydov Analysis COPPER POLYSILICATE CuSiO3 COPPER Polygermanate CuGeO3 Low-Dimensional Compounds SPIN-PEIERLS Transition 

分 类 号：O6[理学—化学]