標題: Raman spectroscopy study of ZnSe and Zn0.84Fe0.16Se at high pressures
作者: Lin, CM
Chuu, DS
Yang, TJ
Chou, WC
Xu, JA
Huang, E
電子物理學系
Department of Electrophysics
公開日期: 15-五月-1997
摘要: The ZnSe powder and Zn0.84Fe0.16Se crystal were studied by Raman scattering spectroscopy at pressures up to 36.0 and 32.0 GPa, respectively. For ZnSe powder at 4.7 and 9.1 GPa, two phase transitions were observed. However, the resulted phases have not been identified yet. As the pressure was increased to 14.4 GPa, the LO phonon peak disappeared while the TO phonon peak was still visible until the metallization pressure, 17.0 GPa was reached. In addition, three unidentified Raman peaks were still observable above the metallization pressure. For Zn0.84Fe0.16Se crystal, the structure transition from possible zinc blende to sodium chloride phase (B-1) was identified by the disappearance of Fe local mode and longitudinal optical (LO) phonon mode at 10.9 GPa. In addition, an unidentified phase transition at 4.7 GPa was observed. The TO phonon and the split TO phonons were still observable at a pressure above the phase transition pressure up to 32.0 GPa. The existence of Fe impurity in the ZnSe up to a concentration of 0.16 reduced the semiconductor-metal phase transition pressure to 10.9 GPa. According to the calculation of Gruneisen parameters, Zn0.84Fe0.16Se was found to have a higher ionicity than ZnSe. Reasons for the observation of Raman peaks at a pressure above the metallization pressure are still unknown.
URI: http://hdl.handle.net/11536/537
ISSN: 0163-1829
期刊: PHYSICAL REVIEW B
Volume: 55
Issue: 20
起始頁: 13641
結束頁: 13646
顯示於類別:期刊論文