Magnetic Ordering in Oxide Solid Solutions.
Final scientific rept. 1 Sep 79-31 Aug 81,
OXFORD UNIV (UNITED KINGDOM) CHEMICAL CRYSTALLOGRAPHY LAB
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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.
- Electricity and Magnetism
- Atomic and Molecular Physics and Spectroscopy