High-pressure studies of (Mg0.9Fe0.1)2SiO4 olivine using raman spectroscopy, X-ray diffraction, and mössbauer spectroscopy.
High-pressure studies of (Mg0.9Fe0.1)2SiO4 olivine using raman spectroscopy, X-ray diffraction, and mössbauer spectroscopy.
复制标题
使用拉曼光谱、X 射线衍射和穆斯堡尔光谱对 (Mg0·9Fe0·1)2SiO4 橄榄石进行高压研究
DOI：
10.1021/ic701983w
复制
发表时间：
2008
影响因子：
4.6
通讯作者：
L. Dubrovinsky
中科院分区：
文献类型：
--
作者：
J. Rouquette;I. Kantor;C. McCammon;V. Dmitriev;L. Dubrovinsky
利用X射线衍射、拉曼光谱和穆斯堡尔谱对（Mg0.9Fe0.1）2SiO4橄榄石进行了高压研究。在40 GPa时，检测到与各向异性压缩机制的饱和度相关的可压缩性的变化。这种变化被解释为从Si2O7二聚体缺陷的外观，从拉曼光谱推断，这种缺陷的外观也占先前报道的压力诱导的非晶化观察到这种材料后，额外的压缩。此外，这种行为之后是在宽压力范围内发生的Fe 2+的自旋交叉，如穆斯堡尔谱所揭示的。
High-pressure studies of (Mg0.9Fe0.1)2SiO4olivine 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 Si2O7dimer 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.