Pressure-dependent Raman spectra of beta-Ca-3(PO4)(2) whitlockite
Pressure-dependent Raman spectra of beta-Ca-3(PO4)(2) whitlockite
复制标题
β-Ca-3(PO4)(2) 白铁矿的压力依赖性拉曼光谱
DOI：
10.1007/s00269-014-0720-y
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发表时间：
2015
影响因子：
1.4
通讯作者：
Xue Weihong
中科院分区：
文献类型：
--
作者：
Zhai Shuangmeng;Wu Xiang;Xue Weihong
在室温条件下，利用金刚石砧池研究了β-Ca3(PO4)2在18.0 GPa下拉曼光谱的压力依赖性。β-Ca3(PO4)2各观测波段的拉曼频率随压力的增加而不断增加。对样品拉曼带压力依赖性的定量分析表明，ν3非对称和ν1对称拉伸振动具有较大的压力系数（3.44 ~ 4.59 cm−1GPa−1），ν4弯曲和ν2变形振动具有较小的压力系数（1.46 ~ 3.12 cm−1GPa−1）。结合前人的研究结果，计算了β-Ca3(PO4)2的等温模式grisen参数。po4对称拉伸振动的分裂在压缩过程中发生变化，并在15.4 GPa左右消失，这可能与高压下po4四面体的演化有关。
The pressure dependence of Raman spectra for whitlockite β-Ca3(PO4)2was investigated up to 18.0 GPa using a diamond-anvil cell at room temperature. The Raman frequencies of all observed bands for β-Ca3(PO4)2continuously increase with increasing pressure. The quantitative analysis of pressure dependence of Raman bands for the sample shows that theν3asymmetric andν1symmetric stretching vibrations are with the larger pressure coefficients (from 3.44 to 4.59 cm−1GPa−1) and that theν4bending andν2deforming vibrations are with the smaller pressure coefficients (from 1.46 to 3.12 cm−1GPa−1). Combined with previous result, the isothermal mode Grüneisen parameters of β-Ca3(PO4)2were calculated. The splitting of the PO4symmetric stretchingν1vibrations changes during compression and disappears around 15.4 GPa, which may be attributed to the evolution of PO4tetrahedra under high pressure.