摘要
本文报道了晶粒尺寸对压力诱导相转变的最新进展。用热力学理论分析了造成纳米晶体材料 (纳米晶 )的相转变压力与同种大块材料不同的主要因素是体积变化比 ,表面能差和内能差。通过估算这三个因素的具体大小 ,可解释文献报道的实验结果 ,并可确定大块材料和纳米晶之间相转变压力发生差异的控制因素。在纳米晶中 。
Recent development of grain-size effect on phase transformations induced by pressure is reported. A thermodynamic theory is presented and three components: the ratio of volume collapses, the surface 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 nanocrystals with respect to transition pressure can be of either sign, depending on the system under investigation.
出处
《物理学进展》
CSCD
北大核心
2002年第2期163-174,共12页
Progress In Physics
基金
DanishTechnicalResearchCouncil
DanishNaturalSciencesResearchCouncil(DANSYNC)
EC"LargeScaleFacility"项目的资助
