Structure and Magnetic Properties of Rapidly Solidified Strontium Ferrites

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  • 急冷凝固したストロンチウムフェライトの組織と磁性
  • キュウレイ ギョウコシタ ストロンチウム フェライト ノ ソシキ ト ジセイ

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Abstract

Amorphous formation regions for the pseudo-ternary SrO-Fe2O3-B2O3 system were investigated using melt spinning and water quenching techniques. The specimens were heat treated, and then examined to determine the composition and temperature ranges where the M-type ferrites precipitated, and the relationship between crystalline phases and magnetic properties was discussed.<BR>The amorphous formation region by melt spinning is restricted within the composition range of less than 60 mol%Fe2O3 and 60-70 mol%SrO, and that by water quenching within the composition range of less than 25 mol%Fe2O3 and more than 30 mol%B2O3.<BR>The region, where M-type ferrites are crystallized by heating, is divided into two: one is the area where the particle size and coercive force of M-type ferrite depend on cooling rate, and the other is the area where they are independent of cooling rate. In the former, the composition ranges are determined where fine M-type ferrite particles of high coercive force (higher than 320 kA/m (4 kOe)) precipitate from the heat-treated amorphous phases. Although the maximum coercive force of 560 kA/m (7000 Oe) is obtained in the latter, fine particles smaller than a superparamagnetic particle size are also formed.

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