Accession Number:

ADA110138

Title:

Magnetic Ordering in Oxide Solid Solutions.

Descriptive Note:

Final scientific rept. 1 Sep 79-31 Aug 81,

Corporate Author:

OXFORD UNIV (UNITED KINGDOM) CHEMICAL CRYSTALLOGRAPHY LAB

Personal Author(s):

Report Date:

1982-01-06

Pagination or Media Count:

9.0

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 Co2Mn2 Fe2-Ni2-. This order is different from that found in mixed fluorides of the type K2MF4Co2Fe2Ni2, and we have considered, in some detail, the unexpected weakness shown by Fe2 in our materials.

Subject Categories:

  • Electricity and Magnetism
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE