Abstract
Time decrease of permeability (disaccommodation) was studied on the ceramic Sr-doped YIG, Y3Fe5−xSrxO12 (0≤x≤0.08).
Two kinds of disaccommodations were observed; one (DA1) was at approximately −170°C and the other (DA2) was at approximately 50°C. The activation energy of DA1 for all specimens was 0.06–0.12 eV, which agreed well with that of electrical conductivity at low temperatures. The activation energy of DA2 was 0.7–1.2 eV, and from the compositional dependence of DA2 and the electrical properties on Sr concentration, it was concluded that Fe4+ ion induced by substitution of Sr2+ ion contributes to DA2 and Fe2+ ion to DA1.
