DISACCOMMODATION OF PERMEABILITY IN MANGANESE-ZINC-TITANIUM FERRITESReportar como inadecuado




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Abstract : The disaccommodation spectra of MnZnTi ferrites generally show only a single peak, at about — 30 °C, in the range — 50 to 120 °C. The amplitude of the peak is proportional to the number of localized ferrous ions, i. e. FeIITiIV pairs. The shift in the peak down from the usual 10 °C is due to a lowering of the activation energy from 0.85 to 0.7 eV, and this decrease is attributed to the effect of electrostatic forces between the quadrivalent ion and its neighbours. The absence of the high temperature peak, process II, is consistent with the localization of the ferrous ions. It was found that Fe2.82Ti0.18O4 also showed an additional disaccommodation peak at — 30 °C.





Autor: J. Knowles P. Rankin

Fuente: https://hal.archives-ouvertes.fr/



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