纳米晶粒在高压下的相变  

Pressure-induced phase transformation in nanocrystals

作　　者：何燕[1] 王晖[1] 刘金芳[1] 蒋建中[1] 

机构地区：[1]浙江大学材料科学与工程学院新结构材料实验室,杭州310027

出　　处：《物理》2007年第3期215-220,共6页Physics

基　　金：国家自然科学基金(批准号:50341032;50425102);家教育部基金(批准号:2.005E+10;2005-55);浙江大学基金资助项目

摘　　要：文章报道了纳米晶粒的晶粒尺寸对压力诱导相变的影响的最新研究进展.采用热力学理论揭示了纳米晶体材料的相变压力与同种大块材料不同的主要因素是体积变化率、表面能差和内能差.通过估算这3个因素的具体大小,可解释文献中报道的实验结果,并且可以确定同种大块材料和纳米晶体材料之间的相变压力发生差异的控制因素.在纳米晶体材料中,晶粒尺寸对结构稳定性和相变压力的影响与体系本身有关.Recent development of is reported. A thermodynamic theory energy differences, and the internal energy differences, governing the change of transition pressure in nanocrystals were uncovered. They can be used to explain the results reported in the literature and to identify the main factor to the change of the transition pressure in nanocrystals. We demonstrated that the grain-size effect on the structural stability in nanoerystals with respect to transition pressure can be of either sign, depending on the system under investigation.

关 键 词：纳米晶体材料 晶粒尺寸效应 固-固相变 相变压力 

分 类 号：O521.23[理学—高压高温物理]