Abstract
In ferrites a large number of after-effects are found, with time constants between nano-seconds and years. In this review the after-effects due to ion-and electron motion will be treated. One finds:
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1)
single-ion effects in combination with lattice deformations, e.g. Mn3+;
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2)
ion effects caused by mobile vacancies, e.g. Co2+;
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3)
effects due to electron transfer:
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a)
Co2+−Co3+
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b)
Me2+−Fe3+, in combination with Me4+ and vacancies.
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c)
Me4+−Fe2+, with Me=Si, Ti (photomagnetic effect).
The electron transfer is found to be related to electrical effects. In analogy to the photoelectric effect, one has found that illumination produces changes in magnetic properties. Generally speaking, one has in ferrites as many problems with donors and acceptors as in other semiconductors. Information from magnetic measurements helps to elucidate their nature.
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van Groenou, A.B. Nachwirkungsmechanismen in Ferriten. Appl. Phys. 2, 47–58 (1973). https://doi.org/10.1007/BF00934173
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DOI: https://doi.org/10.1007/BF00934173