Magnetic Ordering in Oxide Solid Solutions.

Abstract

Powder neutron diffraction, magnetic susceptibility and Mossbauer spectroscopy have been used to investigate solid solutions based upon MnO, FeO, CoO and NiO, and we have completed measurements on NiO-CoO, MnO-CoO, NiO-MnO, FeO-MnO and FeO-CoO. In each system we have examined the changes of spin direction and crystal symmetry as a function of temperature and composition in the antiferromagnetic phases. The results show that the strength of the magnetic anisotropy associated with the metal ions falls in the sequence Co2+>Mn2+>> Fe2+-Ni2+-. This order is different from that found in mixed fluorides of the type K2MF4(Co2+>Fe2+>Ni2+), and we have considered, in some detail, the unexpected weakness shown by Fe2+ in our materials.

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Document Details

Document Type
Technical Report
Publication Date
Jan 06, 1982
Accession Number
ADA110138

Entities

People

  • A. K. Cheetham

Organizations

  • University of Oxford

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Angular Momentum
  • Chemical Compounds
  • Chemistry
  • Crystallography
  • Diffraction
  • Distortion
  • Fluorides
  • Magnetic Properties
  • Materials
  • Measurement
  • Metal Oxides
  • Metals
  • Neutron Diffraction
  • Oxides
  • Physics
  • Security
  • Solid Solutions

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Theoretical Analysis.