压力高达27GPa下天然奥长石的XRD分析（英文）

发布时间：2018-05-11 13:49

本文选题：Compressibility + Bulk　；参考：《光谱学与光谱分析》2017年04期

【摘要】：在室温高达27GPa压力下对天然奥长石(Na_(0.86)K_(0.02)Ca_(0.12)Mg_(0.01)(Fe_(0.01)Al_(1.12)Si_(2.87)O_8))粉晶进行了原位同步辐射X光衍射(XRD)测量,获得了样品的状态方程。实验数据表明随着压力增大奥长石样品在大约3.5GPa发生了三斜向单斜的相变(P1→C2)和在大约10.0GPa发生了单斜对称相变(C2→C2/m)。样品三个相的体模量计算值分别为K_0=73.8GPa(K′=10.98),K_((C2))=124GPa(K′=1.05)和K_((C2/m))=272GPa(K′=0.625)。样品的元素组成影响其T—O—T键角的刚度、M—O键的强度和Si—O—Al键角的弯曲,从而导致奥长石样品在高压行为的特殊变化。三斜相的奥长石晶胞压缩性具明显的各向异性。实验结果表明在冷俯冲带奥长石可能是碱金属和碱土金属深循环的载体。
[Abstract]:The in-situ synchrotron radiation X-ray diffraction (XRDV) measurements of the natural tartan Nax 0.86K _ (+ 0. 02) C _ (2) C _ (2) C _ (2) C _ (2) C _ (2) C _ (2) C _ (2) C _ (2) O _ (8) were carried out at room temperature up to the 27GPa pressure. The in-situ synchrotron radiation X-ray diffraction (XRD) measurements were carried out for the samples, and the equation of state of the samples was obtained by means of in-situ synchrotron radiation X-ray diffraction. The experimental data show that there is a tridiagonal monoclinal phase transition in 3.5GPa and a monoclinic phase transition of C _ 2 / M _ 2 in about 10.0GPa with the increase of pressure. The calculated values of bulk modulus of the three phases are K _ 0 / 73.8GPA / K _ (10. 98) / K _ (1 / 5) and K _ (2 / 2 / m ~ (1) respectively. The element composition of the sample affects the stiffness of the T-O-T bond angle and the bending of the Si-O-Al bond angle and the strength of the M-O bond, which leads to the special change of the high-pressure behavior of the samples. The compressibility of the orschite cell of the triclinic phase has obvious anisotropy. The results show that in the cold subduction zone, the feldspar may be the carrier of alkali metal and alkaline earth metal deep circulation.
【作者单位】：防灾科技学院;中国地震局地震预测重点实验室(中国地震局地震预测研究所);Department
【基金】：the Natural Science Foundation of China(41373059)
【分类号】：P575

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