%A 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)
%T Transport properties of mixing conduction in CaF2 nanocrystals under high pressure
%0 Journal Article
%D 2018
%J Chin. Phys. B
%R 10.1088/1674-1056/27/1/016401
%P 16401-016401
%V 27
%N 1
%U {https://cpb.iphy.ac.cn/CN/abstract/article_120271.shtml}
%8 2018-01-05
%X 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.