Samarium-iron-nitrogen based magnet powder and samarium-iron-nitrogen based magnet
AssigneesTDK Corporation, National Institute of Advanced Industrial Science and Technology
InventorsRyuji Hashimoto, Shusuke Okada
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Abstract
A samarium-iron-nitrogen based magnet powder includes a lanthanoid (Ln), iron (Fe), bismuth (Bi), tungsten (W), and nitrogen (N), wherein the lanthanoid includes samarium (Sm), an atomic ratio of bismuth to a sum of the lanthanoid, iron, bismuth, and tungsten (Bi/(Ln+Fe+Bi+W)) is 1.00 at % or less, an atomic ratio of tungsten to the sum of the lanthanoid, iron, bismuth, and tungsten (W/(Ln+Fe+Bi+W)) is 0.05 at % or more and 0.60 at % or less, and an atomic ratio of tungsten to bismuth (W/Bi) is 1.0 or more and 30.0 or less.
Claims9
A samarium-iron-nitrogen based magnet powder comprising a lanthanoid (Ln), iron (Fe), bismuth (Bi), tungsten (W), and nitrogen (N), wherein
- the lanthanoid includes samarium (Sm),
- an atomic percent of bismuth to a sum of the lanthanoid, iron, bismuth, and tungsten (Bi/(Ln+Fe+Bi+W)) is 1.00 at % or less,
- an atomic percent of tungsten to the sum of the lanthanoid, iron, bismuth, and tungsten (W/(Ln+Fe+Bi+W)) is 0.05 at % or more and 0.60 at % or less,
- an atomic ratio of tungsten to bismuth (W/Bi) is 1.0 or more and 30.0 or less,
- wherein particles each having a core portion and a coating layer coating at least a part of the core portion, are included in the samarium-iron-nitrogen based magnet powder,
- the core portion of each of the particles has a Th2Zn17-type crystal structure, and
- the coating layer of each of the particles has a crystal structure different from the crystal structure of the core portion.
A samarium-iron-nitrogen based magnet powder comprising a lanthanoid (Ln), iron (Fe), bismuth (Bi), tungsten (W), and nitrogen (N), wherein
- the lanthanoid includes samarium (Sm),
- an atomic percent of bismuth to a sum of the lanthanoid, iron, bismuth, and tungsten (Bi/(Ln+Fe+Bi+W)) is 1.00 at % or less,
- an atomic percent of tungsten to the sum of the lanthanoid, iron, bismuth, and tungsten (W/(Ln+Fe+Bi+W)) is 0.05 at % or more and 0.60 at % or less,
- an atomic ratio of tungsten to bismuth (W/Bi) is 1.0 or more and 30.0 or less, and
- a nitrogen release temperature of the samarium-iron-nitrogen based magnet powder is 610° C. or more.
Dependencies are inferred from the claim text.