Accession Number:

AD0627180

Title:

A STUDY OF IRON IMPURITY IN SILVER CHLORIDE USING MAINLY THE MOSSBAUER EFFECT,

Descriptive Note:

Corporate Author:

ILLINOIS UNIV URBANA DEPT OF PHYSICS

Personal Author(s):

Report Date:

1965-01-01

Pagination or Media Count:

43.0

Abstract:

The Mossbauer effect was investigated as a function of temperature between 4K and 550K for sources of Cobalt-57 impurity diffused into single crystal silver chloride. Auxiliary measurements of ionic conductivity, optical absorption, E.S.R. and dielectric dispersion were also made. The Mossbauer spectrum of a freshly prepared sample is attributed to a ferrous ion in a substitutional site bound to a positive ion vacancy in a unique 100 position. Between 4K and 230K a simple quadrupole doublet is observed which is interpreted to show a measure of covalency in the ferrous ion. Above 230K 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. Aged samples have complex Mossbauer spectra which are explained by the formation of additional centers of ferrous ions bound to anion impurities. Author

Subject Categories:

  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE