The mechanism of ultrafast structural switching in superionic copper (I) sulphide nanocrystals

被引：108

作者：

Miller, T. A. ^{[1
]}

Wittenberg, J. S. ^{[1
]}

Wen, H. ^{[2
]}

Connor, S. ^{[1
]}

Cui, Y. ^{[1
]}

Lindenberg, A. M. ^{[1
,3
]}

机构：

[1] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA

[2] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[3] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

来源：

NATURE COMMUNICATIONS | 2013年 / 4卷

关键词：

CRYSTAL-STRUCTURES; LOW CHALCOCITE; PHASE; DYNAMICS; TRANSFORMATION; TEMPERATURE; TRANSITION; NUCLEATION; FREQUENCY; ELECTRON;

D O I：

10.1038/ncomms2385

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Superionic materials are multi-component solids with simultaneous characteristics of both a solid and a liquid. Above a critical temperature associated with a structural phase transition, they exhibit liquid-like ionic conductivities and dynamic disorder within a rigid crystalline structure. Broad applications as electrochemical storage materials and resistive switching devices follow from this abrupt change in ionic mobility, but the microscopic pathways and speed limits associated with this switching process are largely unknown. Here we use ultrafast X-ray spectroscopy and scattering techniques to obtain an atomic-level, real-time view of the transition state in copper sulphide nanocrystals. We observe the transformation to occur on a twenty picosecond timescale and show that this is determined by the ionic hopping time.

引用

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