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中文摘要：
利用金刚石对顶砧（DAC）技术和显微Raman光谱原位测量技术,在0～33.1GPa压力范围对AlN纳米线进行了高压相变研究。在24.4GPa附近,A1（LO）振动模式呈现出较大的非对称性宽化的特征,表明发生了六角纤锌矿到立方岩盐矿的结构转变。岩盐矿结构AlN纳米线的无序声子散射导致了高压相的Raman散射信号。卸压后,高压相的Raman光谱特征被保留下来。根据纤锌矿结构AlN纳米线的振动模式频率随压力的变化关系,讨论了AlN纳米线和体材料在转变路径上的区别,并计算了纤锌矿结构中对应不同声子模式的格林爱森常数。
英文摘要：
High-pressure phase transition of AlN nanowires was investigated in the range of 0～33.1 GPa by in situ Raman spectrum method in diamond anvil cell（DAC）.The A1（LO） vibration mode exhibits considerably asymmetry and broadening,indicating the occurrence of wurtzite-to-rocksalt phase transition.The Raman signal of high-pressure phase can be assigned to the disorder activated Raman scattering of rocksalt AlN.After fully releasing pressure,the Raman characterization of high-pressure phase was quenched.According to the pressure dependence of phonon frequency of AlN nanowires,the difference of transiton path between AlN nanowires and bulk materials was discussed and the mode Grüneisen parameters were determined.
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