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高压下ZnSe纳米带的结构相变及拉曼散射研究

DOI: 10.11858/gywlxb.2009.04.001, PP. 241-246

Keywords: ZnSe纳米带,高压原位角散X射线衍射,结构相变,高压拉曼散射

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Abstract:

利用高压原位角散X射线衍射实验研究了ZnSe纳米带的结构稳定性。发现样品在12.6GPa附近存在一个从立方闪锌矿型到立方岩盐矿型的结构相变,并且在相变点附近存在较大的体积收缩,相对体积变化率达13%。利用Birch-Murnaghan状态方程拟合,得到了闪锌矿相的体弹模量约为56GPa,略低于体材料的体弹模量(约67GPa);并得到其立方岩盐矿相的体弹模量约为116GPa。高压拉曼散射实验结果表明,横光学声子模散射峰在5.5GPa压力附近发生劈裂,纵光学声子模散射峰在12.8GPa压力以上逐渐消失。根据角散实验的体弹模量数据,计算得到了闪锌矿相中对应不同声子模式的格林爱森常数。

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