Abstract
The variation of saturation moment, Curie temperature and susceptibility of ferrimagnetic compounds as a result of substitution of nonmagnetic ions for magnetic ions, can be understood to good approximation on the basis of the random distribution of incomplete superexchange interactions. The two premises required for the understanding are that: (1) a magnetic ion actively participates in ferrimagnetism only if it interacts with two or more magnetic ions in different coördination and (2) the Curie temperature is determined by the number of complete interactions per active magnetic ion per formula unit. The requirement that a magnetic ion interact with at least two other magnetic ions in different coördination is implicit in the fact that ferrimagnetism is a coöperative phenomenon. Recent X-ray diffraction and magnetic studies of the yttrium-iron—calcium-iron-tin garnet system have provided the first firm basis for this understanding.
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