Oxide magnetic material and production method of the same
AssigneeSanyo Electric Co., Ltd.
InventorsTakashi Umemoto, Hideki Yoshikawa, Hitoshi Hirano
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Abstract
An oxide magnetic material of the invention is an oxide magnetic material of a hexagonal ferrite containing Sr, has grain boundary phases in the surrounding of the crystal grains, contains not less than 2% by weight, preferably not less than 5% by weight, of Sr in the grain boundary phases and not less than 10% by weight, preferably not less than 25% by weight, of at least one additive element selected from Bi, V, B and Cu.
Claims22
An oxide magnetic material containing Sr, wherein grain boundary phases exist in the surrounding of crystal grains and not less than 2% by weight of Sr is contained in the grain boundary phases and not less than 10% by weight of at least one additive element selected from Bi, V, B and Cu is contained.
An oxide magnetic material production method comprising the steps of preparing a preliminarily baked powder by preliminarily baking raw material powders of an oxide magnetic material;
- preparing a mixed powder by adding an oxide containing at least one additive element selected from Bi, V, B, and Cu to the preliminarily baked powder;
- and firing the mixed powder to obtain an oxide magnetic material, wherein Sr is contained in the grain boundary phases existing in the surrounding of the crystal grains of the oxide magnetic material after the firing.
Dependencies are inferred from the claim text.