Garnet type ferrite

So-called hexagonal ferrites such as BaFe -Oi9 are ferrimagnetic and are used to construct permanent magnets. A third type of ferrimagnetic mixed oxides are the garnets, Mj FejOjj, of which the best known is yttrium iron garnet (YIG) used as a microwave filter in radar. 

Extension of the microemulsion reaction method to complex oxides has been explored for a wide variety of materials, including aluminosilicate zeolite [45,108] ferrites [109], mullite [110], barium titanate [111,112], and various perovskite-type mixed oxides [112,113], yttrium-iron garnets (YIGs) [114,115], and high TV superconducting oxides [116-120]. 

The list of compounds included here is as comprehensive as in the previous volumes of the series. Not included are magnetic data for perovskites, spinels, garnets and hexagonal ferrites having certain special types of crystal structure, since these are collected in full detail elsewhere [30, 32, 32a, b, c]. For more details on contents and arrangement of the tables, the reader is refered to section 1.1.4 below. 

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