摘要
The charge transport behavior of strontium fluoride nanocrystals has been investigated by in situ impedance measurement up to 35 GPa.It was found that the parameters changed discontinuously at each phase transition.The charge carriers in SrF2nanocrystals include both F~-ions and electrons.In the Fm3 m phase,pressure makes the electronic transport easier,while makes it more difficult in the Pnma phase.The defects at grain boundaries dominate the electronic transport process.Pressure could make the charge-discharge processes in the Fm3 m phase much easier,but make it more difficult in the Pnma phase.
The charge transport behavior of strontium fluoride nanocrystals has been investigated by in situ impedance measurement up to 35 GPa.It was found that the parameters changed discontinuously at each phase transition.The charge carriers in SrF_2 nanocrystals include both F^-ions and electrons.In the Fm3 m phase,pressure makes the electronic transport easier,while makes it more difficult in the Pnma phase.The defects at grain boundaries dominate the electronic transport process.Pressure could make the charge-discharge processes in the Fm3 m phase much easier,but make it more difficult in the Pnma phase.
基金
Project supported by the National Natural Science Foundation of China(Grant Nos.11374131,11674404,11404137,and 61378085)
the Program for New Century Excellent Talents in University,China(Grant No.NCET-13-0824)
the Program for the Development of Science and Technology of Jilin Province,China(Grant Nos.201201079 and 20150204085GX)
the Twentieth Five-Year Program for Science and Technology of Education Department of Jilin Province,China(Grant No.20150221)
