Pressure Effects on the Charge Carrier Transportation of BaF2 Nanocrystals* *Supported by the National Natural Science Foundation of China under Grant Nos 11374131, 11674404, 11404137 and 61378085, the Program for New Century Excellent Talents in University under Grant No NCET-13-0824, the Program for the Development of Science and Technology of Jilin Province under Grant Nos 201201079 and 20150204085GX, and the

Abstract

The charge transport behavior of barium fluoride nanocrystals is investigated by in situ impedance measurement up to 35 GPa. It is found that the parameters change discontinuously at about 6.9 GPa, corresponding to the phase transition of BaF2 nanocrystals under high pressure. The charge carriers in BaF2 nanocrystals include both F ions and electrons. Pressure makes the electronic transport more difficult. The defects at grains dominate the electronic transport process. Pressure could make the charge–discharge processes in the phase more difficult.