Temperature dependence of the hyperfine field in amorphous Fe2O3 |
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Authors: | AM van Diepen ThJA Popma |
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Institution: | Philips Research Laboratories, Eindhoven, The Netherlands |
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Abstract: | Mössbauer spectroscopy was used to follow the hyperfine field at 57Fe nuclei in amorphous Fe2O3. The value of Hhf at T = 0, 470 kG, indicates for the Fe ions, while the reduced hyperfine field versus reduced temperature closely follows a Brillouin function. This result is at variance with theoretical predictions for a spin glass and is also different from amorphous metals with a high content of magnetic ions as reported in the literature. Paramagnetic Mössbauer spectra of amorphous mixed oxides of Fe2O3 with ZnO and CoO show that the 57Fe nuclei in all amorphous ferric oxides studied so far are coordinated in a manner similar to the d site in β F2O3, and distinctly different from the coordination in their crystalline form. |
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