Magneto-ceramics

Natural and synthetic iron oxides not possessing pigment properties are used as raw materials in the production of hard and soft ferrites (see Section 5.5.5.2, Electro- and Magneto-Ceramics) for radio, television and telephone technology, for adhesive magnets, for rotors in dynamos, for low-loss magnetic layers, for DC-motors, for transformer cores, for electronic calculators and high frequency furnaces. This amounts to an annual worldwide production of more than 300 10 t/a. 

Several kinds of electro- and/or magneto-ceramics have been formed into thin fibers by the sol-gel method with the aim at the application to sensing elements. In the preparation of strictly stoichiometric double or multicomponent oxides such as LiNbOs, PbTi03 and so on, the intimate mixing of raw materials at molecular level in sols or gels would permit the direct formation of desired compounds without diffusion process of constituent atoms or ions, which is indispensable in the conventional powder route. It is often observed. 

Schoenes, J. (1992). Magneto-optical properties of metals, alloys and compounds. In Electrical and Magnetic Properties of Metals and Ceramics, Part I. Ed. K. H. J. Buschow. VCH Publishers Inc., New York, pp. 147-257. 

Zhong J, Yi M, Bau HH (2002) Magneto hydrodynamic (MHD) fabricated with ceramic tapes. Sensor Actuat A 96 59-66... 

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