High‐Magnetic‐Field Studies of Orthorhombic and Rhombohedral Al_2−xFe_xO₃ Compounds

M. Schieber, Massachusetts Institute of Technology
Richard B. Frankel, Massachusetts Institute of Technology
N. A. Blum, Massachusetts Institute of Technology
S. Foner, Massachusetts Institute of Technology

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Copyright © 1967 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics and may be found at http://dx.doi.org/10.1063/1.1709580.

NOTE: At the time of publication, the author Richard B. Frankel was not yet affiliated with Cal Poly.

Abstract

Mössbauer and magnetic susceptibility experiments at temperatures down to 4.2°K and in external fields up to 140 kOe show orthorhombic Al_2−xFe_xO₃ (0.63. Rhombohedral Al_1.6Fe_0.4O₃ is paramagnetic above 80°K, and at 4.2°K exhibits a Mössbauer spectrum characteristic of a nonunique hyperfine field; the application of an external magnetic field produces a spectrum with an enhanced Δm=0 line which suggests a canted spin structure similar to that in the high‐temperature phase (T>260°K) of αFe₂O₃.