STUDY OF IRON IONS IN NaCl USING THE MOSSBAUER EFFECT. II. THE VACANCY- IMPURITY ASSOCIATED STATE
Two types of Mossbauer spectra were observed for dilute concentrations of Fe/sup 57/ ions in NaCl. A doublet with a 0.5 mm/sec quadrupole splitting and a 0.5 mm/sec isomer shift relative to stainless steel (80 deg K) is interpreted as the result of either Te/sup 2+/ or Ce/sup 3+/ associated with a positive ion vacancy. A broad unsplit line at --2.07 plus or minus 0.07 mm/sec (80 deg K) is interpreted as the result of Fe/sup +/ substitutionally replacing Na/sup +/. The data are used to make a rough estimate ot the binding energy between positive ion vacancies and cobalt impurities, and the result is consistent with theoretical expectations. A study of the temperature dependence of these two resonances indicates that the ratio of the recoilless emitted gamma rays from the isolated ions compared with the vacancy associated ions is 0.75 plus or minus 0.15 at 80 deg K, 0.24 plus or minus 0.08 at 296 deg K, and 0.16 plus or minus 0.08 at 478 deg K. This huge effect is believed to be due to the difference in elastic constants and mass-symmetry'' contributions to the localized modes, for the two environments. (auth)
- Research Organization:
- Argonne National Lab., Ill.
- NSA Number:
- NSA-17-031200
- OSTI ID:
- 4688308
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Vol. Vol: 131; Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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