Defect Interactions and Their Effect upon the Intrinsic Defect Concentrations for AgCl

摘要

The effect of defect interactions upon the equilibrium concentration of intrinsic Frenkel defects in the silver halides was investigated employing the formalism developed by Allnatt and Cohen. Using the value of the Frenkel pair free formation energy obtained by Abbink and Martin, the intrinsic defect concentrations were calculated for temperatures between 400deg;K and the melting temperature. It was found that the results using this theory were in reasonable agreement with results obtained from the wellhyphen;known Debyendash;Huuml;ckelhyphen;type theory of Lidiard for temperatures below sim;620deg;K, significant differences appearing above this temperature. Defect concentrations were also evaluated using the free formation energy determined by Muuml;ller. In all calculations, significant effects were associated with the temperature dependence of the dielectric constant.