中国物理B ›› 2011, Vol. 20 ›› Issue (10): 108105-108105.doi: 10.1088/1674-1056/20/10/108105
• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇 下一篇
刘建党, 成斌, 张杰, 张丽娟, 翁惠民, 叶邦角
Liu Jian-Dang(刘建党), Cheng Bin(成斌), Zhang Jie(张杰), Zhang Li-Juan(张丽娟),Weng Hui-Min(翁惠民), and Ye Bang-Jiao(叶邦角)†
摘要: This paper studies the pressure-induced phase transition between zincblende (B3) and NaCl (B1) structure ZnSe by using the hydrostatic pressure first-principles pseudopotential plane wave method. The energy-volume and enthalpy-pressure curves are employed to estimate the transition pressure. It is found that ZnSe undergoes a first-order phase transition from the B3 structure to the B1 structure at approximately 15 GPa derived from the energy-volume relation and 14 GPa based on deduction from enthalpy-pressure data. The pressure-related positron bulk lifetimes of the two ZnSe structures are calculated with the atomic superposition approximation method. In comparison with the 13.4% reduction in volume of ZnSe at the transition pressure, the positron bulk lifetime decreases more significantly and the relative value declines up to 22.3%. The results show that positron annihilation is an effective technique to identify and characterize the first-order phase transition and can give valuable information about changes in micro-scale, such as volume shrinkage and compressibility.
中图分类号: (Pressure treatment)