Magnetic Property and Crystal Chemistry of Ilmenite (MeTiO_3) and Hematite (αFe_2O_3) System : II. Magnetic Property
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概要
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Magnetic properties of synthesized solid solutions of ilmenite (MgTiO_3, MnTiO_3, FeTiO_3, CoTiO_3 and NiTiO_3) and hematite (αFe_2O_3) are investigated and it was confirmed that those of any ilmenite-hematite series can be divided into three parts: i) pure ilmenite, ii) solid solutions with R3^^- crystal symmetry and iii) those with R3^^-c crystal symmetry. Pure ilmenites are antiferromagnetics having their Neel temperature below 80°K except MgTiO_3, the Neel temperature of MnTiO_3 being determined to be 41°K. The solid solutions with R3^^- symmetry are ferrimagnetic except MgTiO_3 series which is paramagnetic. Ferrimagnetism in FeTiO_3, CoTiO_3 and NiTiO_3 series is due to the same mechanism, while that in MnTiO_3 series to the different one. The solid solutions with R3^^-c symmetry are again antiferromagnetics on which feeble ferromagnetism is superimposed. Through the analysis of magnetic properties of ferrimagnetic specimens, the sign of superexchange interaction with the coupling angle (∠Me-O-Me) of 90° in the rhombohedral structure was determined.
- 1958-11-05
著者
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Ishikawa Yoshikazu
Institute For Solid State Physics University Of Tokyo
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Akimoto Syun-iti
Geophysical Institute Tokyo University
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Ishikawa Yoshikazu
Institute For Solid State Physics University Of Tokyo:department Of Applied Physics Faculty Of Engin
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