Synthesis and Magnetic Properties of SrO⋅2FeO⋅8Fe2O3 W-type Hexagonal Ferrite
Synthesis and Magnetic Properties of SrO⋅2FeO⋅8Fe2O3 W-type Hexagonal Ferrite
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SrO⋅2FeO⋅8Fe2O3 W型六角晶系铁氧体的合成及磁性能
DOI：
10.2497/jjspm.44.17
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
S. Toyota
中科院分区：
文献类型：
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作者：
S. Toyota
SrO•E2FeO•E8Fe2O3型w型六方铁氧体永磁体含有铁氧化物和铁氧化物，在制造过程中需要复杂的气氛控制，这对于工业生产是不现实的。因此，研究了一种简单的制造方法，其特点是在烧结时加碳和采用氮气气氛相结合，从而成功地制备了高性能永磁体。研究发现，在烧结过程中，添加碳量和干燥坯体的加热温度与氧化还原密切相关。不合适的合成条件容易产生额外的相，如赤铁矿和磁铁矿，从而影响磁性能。特别是由还原反应产生的少量磁铁矿
SYNOPSIS As W-type hexagonal ferrite permanent magnets with the formula SrO•E2FeO•E8Fe2O3 contain both ferrous and ferric oxides, a complicated atmosphere control during the sintering process is necessary in manufacturing, which is impractical for industrial production. Thus, a simple manufacturing method which is characterized by employing a combination of the addition of carbon and the adoption of nitrogen atmosphere in sintering was investigated, so that high performance permanent magnets were successfully prepared. It was found that the additional amount of carbon and the heating temperature for drying green body are closely associated with oxidation and reduction in the sintering process. The unfitted conditions for synthesis are apt to produce extra phase, such as hematite and magnetite which influence magnetic properties. Especially, small amounts of magnetite which are produced by a reduction