Disaccommodation in manganese-zinc ferrite

Abstract

The temperature spectrum of disaccommodation for manganese-zinc ferrous-ferrite toroidal specimens is studied using two methods of magnetic shock. One of these methods, namely, disturbance using a capacitor discharge (ac demagnetization), produces a broad maximum in the disaccommodation against temperature characteristic. The other method of disturbance, using the field provided by a permanent magnet, is shown to give a discrete disaccommodation spectrum, which is used to analyse three room-temperature diffusion effects in terms of the partial pressure of oxygen during firing. One of these effects, which depends only on the oxygen partial pressure (and hence cation vacancy concentration), has not previously been reported at room temperature. The permanent-magnet disturbance is also used to investigate the magnetization states in the toroidal specimens.