Influence of Consolidated Pressure upon Phase Transition and Ionic Conductivity of Nanophase PbF2

The bulk samples with a diameter of 10 mm and thickness of 1 to 2 mm of nanophase PbF2 were prepared by using an inert gas evaporation and in situ consolidating method under the pressure range from 0.3 GPa to 1.8 GPa. The average grain size and phase identification were studied by X-ray diffraction. The ionic conductivity was measured precisely by means of the complex impedance spectra. The results show that the phase content of -PbF2 enhances from 21.6% to 94.5% when the consolidated pressure increases from 0.3 GPa to 1.8 GPa. The ionic conductivity of nanophase PbF2 is about one order of magnitude higher than that of coarse-grain -PbF2, and is approximately equal to that of coarse-grain -PbF2.