In situ XAFS Investigation on Zincblende ZnS up to 31.7 GPa
In situ XAFS Investigation on Zincblende ZnS up to 31.7 GPa
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DOI：
10.1088/0256-307x/30/4/046101
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发表时间：
2013-04
影响因子：
3.5
通讯作者：
Jun Yang;Feng Zhu;Q. Zhang;Ye Wu;Xiang Wu;S. Qin;Juncai Dong;Dongliang Chen
中科院分区：
文献类型：
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作者：
Jun Yang;Feng Zhu;Q. Zhang;Ye Wu;Xiang Wu;S. Qin;Juncai Dong;Dongliang Chen
在31.7 GPa压力下，采用同步辐射X射线，在经典的能量扫描透射模式下，对ZnZn-ZnS中Zn的K边进行了原位高压X射线吸收精细结构（EXAFS）测量。XAFS结果表明，ZnS在16.9GPa下发生了从ZnF 43 m到岩盐Fm 3 m的相变，并伴随着吸收锌原子的第一壳层配位数的增加和约14%的晶胞体积塌陷. F（4）在43 mZnS棒上的等温状态方程符合Birch-Murnaghan三阶状态方程，V-0 = 158.6 +/- 0.8埃（3），B-0 = 87 +/- 5GPa，B-0' = 4（固定）。XAFS谱中ZnS的高压行为与高压XRD结果一致。实验结果表明，利用多毛细管半透镜产生的大发散X射线微束能有效抑制单晶金刚石对顶砧的毛刺，提高XAFS数据质量，为高压XAFS的应用提供了理论依据。
In situ high-pressure x-ray absorption fine structure (EXAFS) measurements on the Zn K-edge in zincblende ZnS are performed up to 31.7 GPa at room temperature using a synchrotron radiation x-ray re-focused by a polycapillary half-lens in the classic energy-scanning transmission mode. The present XAFS data illustrate that ZnS undergoes a phase transition from zincblende F43m to rocksalt Fm3m at 16.9 GPa, accompanied by the increase of the first shell coordination number of the absorption zinc atoms and the unit-cell volume collapse of similar to 14%. The isothermal equation of state of the F (4) over bar 43m ZnS is well presented by the third-order Birch-Murnaghan equation of state with V-0 = 158.6 +/- 0.8 angstrom(3), B-0 = 87 +/- 5GPa and B-0' = 4 (fixed). The high-pressure behavior of ZnS from the XAFS spectra is consistent with the previous high-pressure XRD results. In addition, the present experimental method demonstrates that the large divergent x-ray micro-beam induced by a polycapillary half-lens can suppress effectively the glitches from single crystal diamond anvil and improve significantly the quality of the XAFS data, which will shed light on the high-pressure XAFS applications.