Sm—Fe—N-based magnet powder, Sm—Fe—N-based sintered magnet, and production method therefor

A Sm—Fe—N-based sintered magnet, comprising:

• a sintered body of a Sm—Fe—N-based magnetic material, wherein
• an average grain size of crystal grains of the Sm—Fe—N-based magnetic material is not larger than 5 μm,
• the grain size of the crystal grains of the Sm—Fe—N-based magnetic material powder is 0.04 μm or more, and
• a full width at half maximum of a diffraction peak of a (220) plane in an X-ray diffraction profile of the Sm—Fe—N-based magnetic material is not larger than 0.0033 Å.

A method for producing a Sm—Fe—N-based sintered magnet, the method comprising:

• pressure-sintering a Sm—Fe—N-based magnetic material powder under an atmosphere of an oxygen concentration not larger than 10 ppm, wherein
• an average particle size of the Sm—Fe—N-based magnetic material powder is not larger than 5 μm,
• the particle size of the Sm—Fe—N-based magnetic material powder is 0.04 μm or more, and
• a full width at half maximum of a diffraction peak of a (220) plane in an X-ray diffraction profile of the Sm—Fe—N-based magnetic material powder is not larger than 0.0033 Å.