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Chin. Phys. B, 2018, Vol. 27(1): 016401    DOI: 10.1088/1674-1056/27/1/016401
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

Transport properties of mixing conduction in CaF2 nanocrystals under high pressure

Ting-Jing Hu(胡廷静)1, Xiao-Yan Cui(崔晓岩)1, Jing-Shu Wang(王婧姝)1, Jun-Kai Zhang(张俊凯)1, Xue-Fei Li(李雪飞)1, Jing-Hai Yang(杨景海)1, Chun-Xiao Gao(高春晓)2
1 Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, National Demonstration Center for Experimental Physics Education, Jilin Normal University, Siping 136000, China;
2 State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
Abstract  We report on the intriguing electrical transport properties of compressed CaF2 nanocrystals. The diffusion coefficient, grain and grain boundary resistances vary abnormally at about 14.37 GPa and 20.91 GPa, corresponding to the beginning and completion of the Fm3m-Pnma structural transition. Electron conduction and ion conduction coexist in the transport process and the electron conduction is dominant. The electron transference number of the Fm3m and Pnma phases increases with pressure increasing. As the pressure rises, the F- ion diffusion and electronic transport processes in the Fm3m and Pnma phases become more difficult. Defects at grains play a dominant role in the electronic transport process.
Keywords:  high pressure      electrical properties      phase transitions      transport properties  
Received:  17 August 2017      Revised:  28 September 2017      Accepted manuscript online: 
PACS:  64.60.-i (General studies of phase transitions)  
  72.20.-i (Conductivity phenomena in semiconductors and insulators)  
  07.35.+k (High-pressure apparatus; shock tubes; diamond anvil cells)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11374131, 11674404, 11404137, and 61378085), Program for the Development of Science and Technology of Jilin Province, China (Grant Nos. 201201079 and 20150204085GX), Twentieth Five-Year Program for Science and Technology of Education Department of Jilin Province, China (Grant No. 20150221), and Open Project of State Key Laboratory of Superhard Materials (Jilin University), China (Grant No. 201710).
Corresponding Authors:  Xiao-Yan Cui, Chun-Xiao Gao     E-mail:  xycuimail@163.com;cc060109@qq.com

Cite this article: 

Ting-Jing Hu(胡廷静), Xiao-Yan Cui(崔晓岩), Jing-Shu Wang(王婧姝), Jun-Kai Zhang(张俊凯), Xue-Fei Li(李雪飞), Jing-Hai Yang(杨景海), Chun-Xiao Gao(高春晓) Transport properties of mixing conduction in CaF2 nanocrystals under high pressure 2018 Chin. Phys. B 27 016401

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