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- W1907929925 abstract "The Raman spectra of Ge-clinopyroxenes CaM2+Ge2O6 (M2+ = Mg, Mn, Fe, Co, Ni, Zn), general formula M2M1T2O6, are reported for the first time. Their spectral features are discussed in comparison with corresponding Si-pyroxenes. The vibrational wavenumbers of germanates may be roughly obtained by a scale factor of about ~0.8 by those of the corresponding silicates, due to the Ge-Si mass difference. The main peaks in the germanate Raman spectra at ~850 and ~540 cm−1 may be related to Ge-O tetrahedral stretching and chain bending, respectively; minor peaks between 200 and 400 cm−1 are ascribed to bending and stretching of the non-tetrahedral cations. Within Ge-pyroxenes, possible correlations between crystallographic parameters and the vibrational wavenumbers are investigated. The main stretching mode at ~850 cm−1 shows wavenumber changes with M2+ substitutions, but no simple correlation can be found with M2+ cation mass or size. On the other hand, the chain bending wavenumber linearly decreases with increasing ionic radius of the M2+ cation: the expansion of the M1 polyhedron reduces the chain kinking angle and the Ge-Ge distances correspondingly increase. Copyright © 2015 John Wiley & Sons, Ltd." @default.
- W1907929925 created "2016-06-24" @default.
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- W1907929925 date "2015-04-19" @default.
- W1907929925 modified "2023-09-27" @default.
- W1907929925 title "Raman spectroscopy of CaM<sup>2+</sup>Ge<sub>2</sub>O<sub>6</sub>(M<sup>2+</sup> = Mg, Mn, Fe, Co, Ni, Zn) clinopyroxenes" @default.
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- W1907929925 doi "https://doi.org/10.1002/jrs.4681" @default.
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