Abstract
An indication of the dependence of the magnetic properties of polycrystalline sintered ferrites on the conditions of preparation is given.
In the design and understanding of the properties of these materials it is valuable, and sometimes essential, to make use of data obtained from measurements on single crystals. Methods of preparation of ferrite single crystals, namely the Verneuil or flame-fusion method, the Bridgman–Stockbarger method, and the lead oxide flux method, are briefly described.
To illustrate the way in which measurements on polycrystalline and single-crystal specimens complement each other in the understanding of the magnetic behaviour of ferrites, an investigation of the properties of a ferrite with a so-called “square” hysteresis loop is discussed.
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