1. Mössbauer effect of 57-Fe in barium ferrite
- Author
-
Li Xiang-dong and Zeng Ling-zhi
- Subjects
chemistry.chemical_classification ,Mössbauer effect ,Chemistry ,Analytical chemistry ,General Chemistry ,Quadrupole splitting ,Condensed Matter Physics ,Ion ,chemistry.chemical_compound ,Nuclear magnetic resonance ,Mössbauer spectroscopy ,Materials Chemistry ,medicine ,Ferric ,Hyperfine structure ,Inorganic compound ,Barium ferrite ,medicine.drug - Abstract
Mossbauer spectra were taken of barium ferrite at temperatures ranging from 15K to 733K. The hyperfine parameters H,δ, f for ferric ions as function of temperature at different lattice sites were determined. Above 300K, the effective vibrating mass of the Mossbauer atom at the Fe(2) site Meff = 65±5 (in U) is larger than those at other sites, indicating a stronger covalent bonding with the neighbour oxygen atoms. We also discuss the temperature dependence of the unusually large quadrupole splitting due to ferric iron in the bipyramidal position, with a very small Mossbauer lattice temperature θM = 233±15 K.
- Published
- 1990