A Study of Iron Impurity in Silver Chloride Using Mainly the MBssbauer Effect

摘要

The Mossbauer Effect has been investigated as a function of 57 temperature between A°K and 550°K for sources of Cobalt impurity diffused into single crystal silver chloride. Auxiliary measurements of ionic conductivity, optical absorption, E.S.R. and dielectric dispersion have also been made. The Mossbauer spectrum of a freshly prepared sample is attributed to a ferrous ion in a substitution site bound to a positive ion vacancy in a unique (100) position. Between 4°K and 230°K a simple quadruple doublet is observed which is interpreted to show a measure of covalence in the ferrous ion. Above 230°K the spectral lines broaden and the spectrum collapses to a single line; it is proposed that this effect is a result of the thermal motion of the vacancy around the impurity. The deduced vacancy jump times are shown to agree with those derived from dielectric dispersion measurements.