Raman spectrometry study of phase stability and phonon anharmonicity of Al(3)BC(3) at elevated temperatures and high pressures

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	Raman spectrometry study of phase stability and phonon anharmonicity of Al(3)BC(3) at elevated temperatures and high pressures
	H. M. Xiang; F. Z. Li; J. J. Li; J. M. Wang; X. H. Wang; J. Y. Wang; Y. C. Zhou
	2011
发表期刊	Journal of Applied Physics
ISSN	0021-8979
卷号	110 期号:11
摘要	In situ Raman spectra of Al(3)BC(3) have been measured at elevated temperatures of up to 1000 degrees C and high pressures of up to 32 GPa. It is shown that there are no abnormal phonon shifts when the measurement conditions were up to 1000 degrees C or up to 27 GPa, which indicates a good structural stability of Al(3)BC(3) at high temperatures and pressures. The Raman active phonon modes were assigned comprehensively to the corresponding vibration modes by first-principles calculations. Interestingly, an abnormal softening of the E(1g)(559 cm(-1)) and E(2g)(578 cm(-1)) phonon modes were observed when the pressure was higher than 27 GPa. Correlating the results with previous theoretical predictions of polymorphism in Al(3)BC(3), the mode softening at higher pressures might originate from the structural transformation (from hexagonal to tetragonal symmetry) involving changes of Al and C coordination numbers. In addition, the phonon anharmonicity has been investigated by studying the temperature and pressure dependence of the Raman peak shifts and broadenings. Finally, the present work has highlighted that in situ Raman spectrometry study is a sensitive method for investigating the structural stability and phonon anharmonicity of complex ceramics. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3665197]
部门归属	[xiang, huimin; li, fangzhi; li, jingjing; wang, jiemin; wang, xiaohui; wang, jingyang; zhou, yanchun] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [xiang, huimin; li, jingjing] chinese acad sci, grad sch, beijing 100039, peoples r china. [zhou, yanchun] aerosp res inst mat & proc technol, beijing 100076, peoples r china.;wang, jy (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china;jywang@imr.ac.cn
关键词	Boron-carbide Mechanical-properties Thermal-expansion Optical Phonons Dependence Aluminum 1st-principles Calibration Composites Crystal
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/30779
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	H. M. Xiang,F. Z. Li,J. J. Li,et al. Raman spectrometry study of phase stability and phonon anharmonicity of Al(3)BC(3) at elevated temperatures and high pressures[J]. Journal of Applied Physics,2011,110(11).
APA	H. M. Xiang.,F. Z. Li.,J. J. Li.,J. M. Wang.,X. H. Wang.,...&Y. C. Zhou.(2011).Raman spectrometry study of phase stability and phonon anharmonicity of Al(3)BC(3) at elevated temperatures and high pressures.Journal of Applied Physics,110(11).
MLA	H. M. Xiang,et al."Raman spectrometry study of phase stability and phonon anharmonicity of Al(3)BC(3) at elevated temperatures and high pressures".Journal of Applied Physics 110.11(2011).