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-1 for the outer lines of α-Fe were obtained at room temperature. Mössbauer spectra were fitted to Lorentzian line shapes using the commercially available fitting program NORMOS, written by R. A. Brand (distributed by Wissenschaftliche Electronik GmbH, Germany).
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The primitive cell of the end-member Mg2SiO4 contains four formula units, leading to the following irreducible representations: Ã, 11Ag, 11B1g, 7B2g, 7B3g, 10Au, 10B1u, 14B2u, 14B3u. Of these, 35 modes are infrared active and 36 modes are Raman active: 11Ag, 11B1g, 7B2g, 7B3g. One can classify the modes of SiO4 entities as external or internal and, for the latter, state their derivation. The symmetry of a free SiO4 ion is Td, and it has four internal modes of vibration: ν1(A1, ν2(E, ν3(F 2, and ν4F2, In Mg2SiO 4, however, free SiO4 ions occupy the Cs symmetry sites, and the anisotropic crystal field in the D 2h16 space
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24
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33645686311
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For an example of pressure-induced amorphization characterized by X-ray diffraction, see
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