Sign of the magnetic coupling of Fe2+ and Fe3+ in biotite |
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| Authors: | M G Townsend G Longworth |
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| Institution: | 1. Department of Energy, Mines and Resources Canada, K1A 0G1, Ottawa, Canada
2. AERE, Harwell, England
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| Abstract: | Mössbauer spectra of biotite at 4 K are reported. The biotite crystals were oriented with the c-axis parallel to the γ-ray direction and some spectra were recorded with external magnetic fields of 40 kOe applied at right angles to the c-axis. Decrease of the magnetic-hyperfine field of both Fe2+ and Fe3+ ions on application of the external field shows that both Fe3+-Fe3+ pairs and Fe2+-Fe2+ pairs are coupled ferromagnetically. |
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