標題: Lattice Dynamics and Crystalline Properties of Wurtzite Zn(1-x)Mg(x)O Powders under High Pressure
作者: Lin, Y. C.
Tseng, C. L.
Chou, W. C.
Chia, C. H.
Han, T. C.
Shen, J. L.
電子物理學系
Department of Electrophysics
公開日期: 13-Oct-2011
摘要: This investigation systematically studies the lattice dynamics and crystalline properties in Zn(1-x)Mg(x)O using high-pressure Raman spectroscopy. The incorporation of Mg and the application of external pressure cause distinct phonon vibrational behaviors in ZnO. Accordingly, the 202.7, 332.7, and 511.5 cm(-1) phonons, which have been controversially assigned, can be conclusively identified. Detailed Raman spectra reveal that the metallic phase transition of ZnO is complete by around 13.2 GPa, which pressure is found to decrease as the Mg content increases. Upon pressure release, an unusual hysteresis effect (>10.0 GPa) in Zn(1-x)Mg(x)O is observed. The degree of crystal ionicity and anisotropy importantly affects the phase transition pressure of Zn(1-x)Mg(x)O. Under ambient conditions, ZnO becomes more ionic upon the incorporation of Mg and becomes more covalent under higher pressure. These results are caused by the interplay between the pressure dependence of the high-frequency dielectric constant and Born's transverse dynamical effective charge. The E(1)-A(1) splitting of the longitudinal and transverse optical phonons is analyzed, yielding insight into the pressure-dependent crystal anisotropy of Zn(1-x)Mg(x)O.
URI: http://dx.doi.org/10.1021/jp207691c
http://hdl.handle.net/11536/14737
ISSN: 1932-7447
DOI: 10.1021/jp207691c
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 115
Issue: 40
起始頁: 19962
結束頁: 19970
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