Physics of anisotropic materials under pressure

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题名:	Physics of anisotropic materials under pressure
作者:	薛宏中
贡献者:	淡江大學物理學學系
日期:	1997
上传时间:	2016-10-12 10:44:19 (UTC+8)
摘要:	The structural, vibrational, and electronic properties of anisotropic materials under compression are comprehensively investigated in this thesis. Recent developments in the techniques of high-pressure X-ray diffraction and Raman scattering, and significant advances in first principle simulations provide detailed high-pressure studies of condensed matter systems. In view of the widely disparate strength of cohesive forces, these studies consist of ionic compounds, quasi-two dimensional semiconductors, quasi-molecular solids, and end with liquid crystals. As a result of the coexistence of different hierarchical interactions in anisotropic systems, evidence of preferential pressure-induced enhancement of weak bonding is found not only in the structural response to external hydrostatic pressure but also in vibrational and electronic behaviour. Further, the understanding of pressure-induced breakdown of rigid-layer vibrations (explored in layered compounds), pressure-induced electron transfer in molecular crystals, and strong overlap of inter- and intra-molecular vibrational modes of liquid crystals provides insight into the essential physics of flexible molecular systems.
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