High-Pressure Studies of (Mg0.9Fe0.1)2SiO4 Olivine Using Raman Spectroscopy, X-ray Diffraction, and Mössbauer Spectroscopy

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• 作者：J. Rouquette ; I. Kantor ; C. A. McCammon ; V. Dmitriev ; L. S. Dubrovinsky
• 刊名：Inorganic Chemistry
• 出版年：2008
• 出版时间：April 7, 2008
• 年：2008
• 卷：47
• 期：7
• 页码：2668 - 2673
• 全文大小：1014K
• 年卷期：v.47,no.7(April 7, 2008)
• ISSN：1520-510X

文摘

High-pressure studies of (Mg_0.9Fe_0.1)₂SiO₄ olivine were performed at ambient temperature using X-ray diffraction, Raman spectroscopy, and Mössbauer spectroscopy. At ~40 GPa, a change of compressibility associated with saturation of the anisotropic compression mechanism was detected. This change is interpreted to result from the appearance of Si₂O₇ dimer defects, as deduced from Raman spectroscopy; the appearance of such defects also accounts for the previously reported pressure-induced amorphization observed for this material upon additional compression. Furthermore, this behavior is followed by a spin crossover of Fe²⁺ that occurs over a wide pressure range, as revealed by Mössbauer spectroscopy.