Crystal-crystal phase transformation via surface-induced virtual premelting

被引：43

作者：

Levitas, Valery I. ^{[1
,2
,3
]}

Ren, Zhaohui ^{[4
]}

Zeng, Yuewu ^{[4
,5
]}

Zhang, Ze ^{[4
,5
]}

Han, Gaorong ^{[4
]}

机构：

[1] Iowa State Univ, Dept Aerosp Engn, Ames, IA 50011 USA

[2] Iowa State Univ, Dept Mech Engn, Ames, IA 50011 USA

[3] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA

[4] Zhejiang Univ, Dept Mat Sci & Engn, State Key Lab Silicon Mat, Cyrus Tang Ctr Sensor Mat & Applicat, Hangzhou 310027, Peoples R China

[5] Zhejiang Univ, Ctr Elect Microscope, Hangzhou 310027, Peoples R China

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 22期

基金：

美国国家科学基金会;

关键词：

MELTING TEMPERATURE; SIZE; STRESS; FILMS;

D O I：

10.1103/PhysRevB.85.220104

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A mechanism for crystal-crystal phase transformations (PTs) via surface-induced virtual premelting is justified thermodynamically and confirmed experimentally for the PTs in PbTiO3 nanofibers. When the thickness of the surface melt (which appears much below the melting temperature, especially for nano-objects) exceeds the size of the critical product nucleus, nucleation and growth of the product crystal occur. For nanowires, premelting starts near the smallest size, and hydrodynamic flow driven by reduction in the external surface leads to a large change in shape and further promotion of crystal-crystal PT. During the product crystal-growth stage, virtual melting is observed experimentally within the crystal-crystal interface.

引用

页数：5

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