Mössbauer Studies of the Magnetic Behaviour of the Cr2O3-Fe2O3 System

Publisher Website
Google Scholar
Abstract
The magnetic structure of the (1 − x) Cr2O3–x Fe2O3 system ≦x ≦ 4.95 wt %), was investigated by Mössbauer measurements in the temperature range 80 to 300 °K. The temperature dependence of the hyperfine field clearly supports the cone spiral structure, originally proposed by neutron diffraction work. A linear decrease in the cone half‐angle θ has been observed with increasing temperature and also to some extent with increasing x. The variation of the quadrupole coupling constant, |1/2 e2 q Q|, with temperature and x follows qualitatively the temperature and composition dependence of the trigonality (c/a) of the rhombohedral Cr2O3–Fe2O3 lattice. It is also suggested that the anomalous Mössbauer spectra observed earlier in the 0.965 Cr2O3–0.035 Fe2O3 system [8] were probably due to the superparamagnetic effect.

This publication has 31 references indexed in Scilit: