Comparison of the Vibrational Spectra of Copper Polysilicate, CuSiO<sub>3</sub>, with Those of the Prototypic Copper Polygermanate, CuGeO<sub>3</sub> — Oak Academic Publishing
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Comparison of the Vibrational Spectra of Copper Polysilicate, CuSiO<sub>3</sub>, with Those of the Prototypic Copper Polygermanate, CuGeO<sub>3</sub>
Materials Science and Crystallography, Technical University of Clausthal, Clausthal-Zellerfeld, Lower Saxony, Germany
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Materials Science and Crystallography, Technical University of Clausthal, Clausthal-Zellerfeld, Lower Saxony, Germany
1 Materials Science and Crystallography, Technical University of Clausthal, Clausthal-Zellerfeld, Lower Saxony, Germany
2 Materials Science and Crystallography, Technical University of Clausthal, Clausthal-Zellerfeld, Lower Saxony, Germany
Orthorhombic copper polysilicate, CuSiO 3 , is isotypic to the spin-Peierls compound CuGeO 3 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 CuSiO 3 , measured at room temperature on polycrystalline samples. A comparison of the optical phonons, predicted by a factor group analysis, with those observed for the CuGeO 3 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 CuSiO 3 . 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.
KeywordsIR/FIR SpectraRaman SpectraFactor Group AnalysisDavydov AnalysisCopper PolysilicateCuSiO<sub>3</sub>Copper PolygermanateCuGeO<sub>3</sub>Low-Dimensional CompoundsSpin-Peierls Transition
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