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Abstract
Abstract The effect of hydrostatic pressure on the ionic conductivities in β-PbF2 β-Pb1−x Mx mF2+(m−2)x (where Mm = Na+, Cd+2, Tb+3, U+4), LaF3 and La1−xCaxF3-x has been investigated in the temperature range between 300 K and 700 K for pressures up to 0.25 GPa (for β-PbF2) and 0.8 GPa (for LaF3). The activation volumes of defect formation and migration, impurity defect segregation and dissociation were determined from the effect of pressure on the conductivity. Keyes’ treatment based on the strain energy Zener model in Gruenisen approximation was used to estimate theoretical values of activation volumes.
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