STUDY OF THE LOW-TEMPERATURE TRANSITION IN MAGNETITE AND THE INTERNAL FIELDS ACTING ON IRON NUCLEI IN SOME SPINEL FERRITES, USING MOSSBAUER ABSORPTION
A study is made of the internal fields acting on Fe/sup 5//sup 7/ nuclei in some spinel ferrites, with particular reference to the low-temperature order- disorder transition in magnetite, using the techniques of Mossbauer absorption. For the Fe/sup 3//sup +/ ions at both the octahedral and tetrahedral sites in nickel ferrite (NiFe/sub 2/O/sub 4/ at 300 deg K, gamma Fe/sub 2/O/sub 3/ at 85 and 300 deg K, and magnetite (Fe/sub 3/O/sub 4/) at 85 deg K, the effective magnetic field at the Fe/sup 5//sup 7/ nuclei is the same and equal to about 5 1 x lO/sup 5/ gauss. In magnetite, the value of H/sub e//sub f//sub f/ in the Fe/ sup 2//sup +/ ions is about 4.5 x lO/sup 5/ gauss at 85 deg K. Measurements on Fe/ sub 3/O/sub 4/ at room temperatures provide a microscopic confirmation of Verwey's hypothesis that above the transition temperature of magnetite there is a fast exchange between the ferrous and ferric ions in the octahedral sites. (auth)
- Research Organization:
- Hebrew Univ., Jerusalem
- NSA Number:
- NSA-15-019920
- OSTI ID:
- 4064992
- 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- Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 122; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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