The Néel transition and magnetic properties of terrestrial, synthetic, and lunar ilmenites
| Autor: | Frank E. Senftle, David L. Griscom, Arthur N. Thorpe, Corrine Alexander, C. Briggs, Jean A. Minkin |
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| Rok vydání: | 1975 |
| Předmět: |
Condensed matter physics
Magnetic domain Transition temperature Mineralogy engineering.material Magnetic susceptibility Magnetic anisotropy Geophysics Space and Planetary Science Geochemistry and Petrology Earth and Planetary Sciences (miscellaneous) engineering Lunar soil Néel temperature Ilmenite Geology Superparamagnetism |
| Zdroj: | Earth and Planetary Science Letters. 26:377-386 |
| ISSN: | 0012-821X |
| DOI: | 10.1016/0012-821x(75)90014-x |
| Popis: | The magnetic susceptibility of a terrestrial, synthetic and lunar ilmenite specimen has been measured from 4 to 300 K. All specimens had a single Neel temperature transition which ranged from 56 to 57.7 K. In one case the powdered specimen was partially aligned in the magnetic field prior to the susceptibility measurements and the Neel transition was observed to shift to 60 K indicating magnetic anisotropy. A study of several magnetic parameters calculated from the experimental data showed gross impurities in the terrestrial specimen, single-domain to multi-domain metallic iron in the synthetic specimen, and a small amount of superparamagnetic metallic iron in the lunar sample. No multidomain iron was observed in the lunar ilmenite. The results of electron spin resonance measurements were also in general agreement with these findings. Because of the absence of Fe 3+ compared to most terrestrial samples it is suggested that the anisotropic magnetic parameters be determined on lunar ilmenite when a large enough single crystal becomes available. |
| Databáze: | OpenAIRE |
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