Nanoscale Behavior and Manipulation of the Phase Transition in Single-Crystal Cu2Se

被引:41
作者
Chen, Lu [1 ,2 ]
Liu, Jun [1 ,2 ]
Jiang, Chao [1 ,2 ]
Zhao, Kunpeng [3 ]
Chen, Hongyi [3 ]
Shi, Xun [3 ]
Chen, Lidong [3 ]
Sun, Chenghua [4 ]
Zhang, Shengbai [5 ]
Wang, Yong [1 ,2 ]
Zhang, Ze [1 ,2 ]
机构
[1] Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China
[2] Zhejiang Univ, Sch Mat Sci & Engn, Ctr Electron Microscopy, Hangzhou 310027, Zhejiang, Peoples R China
[3] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China
[4] Swinburne Univ Technol, Fac Sci Engn & Technol, Dept Chem & Biotechnol, Hawthorn, Vic 3122, Australia
[5] Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA
基金
中国国家自然科学基金;
关键词
Cu2Se; in situ transmission electron microscopy; second-order phase transitions; SIZE DEPENDENCE; MELTING-POINT; TEMPERATURE; CONDUCTIVITY; ELECTRON; DYNAMICS;
D O I
10.1002/adma.201804919
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Phase transition is a fundamental physical phenomenon that has been widely studied both theoretically and experimentally. According to the Landau theory, the coexistence of high- and low-temperature phases is thermodynamically impossible during a second-order phase transition in a bulk single crystal. Here, the coexistence of two (alpha and beta) phases in wedge-shaped nanosized single-crystal Cu2Se over a large temperature range are demonstrated. By considering the surface free-energy difference between the two phases and the shape effect, a thermodynamic model is established, which explicitly explains their coexistence. Intriguingly, it is found that with a precise control of the heating temperature, the phase boundary can be manipulated at atomic level. These discoveries extend the understanding of phase transitions to the nanoscale and shed light on rational manipulation of phase transitions in nanomaterials.
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页数:6
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