纳米ZnO在高压下的性质与结构研究

The Properties and Structural Investigation of ZnO Nanocrystals under Pressure

在金刚石压砧上测量了 2 0nm的ZnO和体相粉末ZnO的电阻 压力关系。研究结果表明 ,2 0nm的ZnO在 7.9GPa压力时出现了相变 ,而体相粉末ZnO在 5GPa时有相变发生。虽然粒径小的相变压力大于粒径大的 ,但与以前关于体相粉末ZnO所报道的文献结果有所不同。文中对此作了解释 ,并对纳米ZnO在压力下的畴破裂进行了研究。

The R-p relationship of ZnO nanocrystals and bulk materials were determined by diamond anvil cell (DAC).Research results show that a phase transformation begins at the 7.9 GPa when the particle is 20 nm nanocrystals,whereas the phase transition of ZnO bulk materials at 5 GPa.The smaller particle has larger phase transition pressure,and transformation pressure of bulk materials determined by DAC is lower than that previously reported.The structural properties of ZnO were discussed,and the domain fracture of nanocrystals under pressure was investigated.