Comparison of the Vibrational Spectra of Copper Polysilicate, CuSiO<sub>3</sub>, with Those of the Prototypic Copper Polygermanate, CuGeO<sub>3</sub>
Comparison of the Vibrational Spectra of Copper Polysilicate, CuSiO<sub>3</sub>, with Those of the Prototypic Copper Polygermanate, CuGeO<sub>3</sub>作者机构：Materials Science and Crystallography Technical University of Clausthal Clausthal-Zellerfeld Lower Saxony Germany
出 版 物：《American Journal of Analytical Chemistry》 (美国分析化学（英文）)
年 卷 期：2018年第9卷第6期
页 面：311-321页
主 题：IR/FIR Spectra Raman Spectra Factor Group Analysis Davydov Analysis Copper Polysilicate CuSiO3 Copper Polygermanate CuGeO3 Low-Dimensional Compounds Spin-Peierls Transition
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.
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