On protons, iron and the high‐pressure behavior of ringwoodite
On protons, iron and the high‐pressure behavior of ringwoodite
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关于质子、铁和尖晶橄榄石的高压行为
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
D. Frost
中科院分区：
文献类型：
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作者：
A. Kleppe;A. Jephcoat;J. Smyth;D. Frost
在室温至60 GPa下，在金刚石对顶砧单元中测量了含水Fo 89-灵伍德石单晶的拉曼光谱。分别在796和841 cm−1处观察到对应于SiO 4四面体的不对称和对称伸缩振动的强峰。其他谱带出现在709-939和100-250 cm−1之间。尖晶石结构的SiO 4伸缩模式连续移动到60 GPa。在40 GPa附近，新的拉曼谱带出现在550-680 cm−1区域，强度达到最大压力，这种变化在压力释放时是可逆的。这种压力引起的结构变化似乎与Fe和质子取代产生的结构复杂性有关。
Raman spectra of a single crystal of hydrous Fo89‐ringwoodite have been measured in a diamond‐anvil cell at room temperature to 60 GPa. Strong peaks corresponding to asymmetric and symmetric stretching vibrations of the SiO4 tetrahedra are observed at 796 and 841 cm−1 respectively. Additional bands occur in the range 709–939 and 100–250 cm−1. The SiO4 stretching modes of the spinel structure shift continuously up to 60 GPa. Near 40 GPa new Raman bands emerge in the region 550–680 cm−1 gaining intensity to the maximum pressure, a change that is reversible on pressure release. This pressure‐induced modification in the structure appears to be related to structural complexity generated by both Fe and proton substitution.