The Effects of Hydrostatic Pressure on the Ionic Conductivity of AgBr

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Abstract
Comparison of the conductivities of pure AgBr and AgBr doped with varying concentrations of CdBr2 in the intrinsic temperature range determines the concentration of defects and the mobilities of silver vacancies and interstitial ions. These quantities have been measured as a function of pressure up to 8000 kg/cm2 at three temperatures below 300°C. From the pressure variation of the defect concentration, the molar volume ΔV* of the imperfections is found to be 16 cc/mole below 300°C. An analysis of the pressure variation of the mobilities u0 and u□ of the Ag+ interstitial ions and of the silver vacancies, respectively, indicates that the free volumes associated with their motions are 2.7 cc/mole and 7.4 cc/mole. The value of ΔV*=16 cc/mole is consistent with the Frenkel disorder type. At temperatures above 300°C, however, the observed value of |∂ lnσ/∂p| is larger than expected from a simple Frenkel disorder type. An effort is made to interpret this behavior in terms of mixed Frenkel and Schottky defects.

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