Importance

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Abstract

To provide an R-T-B based sintered magnet having high B_r and high H_cJ without using Dy. Disclosed is an R-T-B based sintered magnet which includes an Nd₂Fe₁₄B type compound as a main phase, and comprises the main phase, a first grain boundary phase located between two main phases, and a second grain boundary phase located between three or more main phases, wherein the composition of the R-T-B based sintered magnet comprises: R: 29.0% by mass or more and 31.5% by mass or less, B: 0.86% by mass or more and 0.90% by mass or less, Ga: 0.4% by mass or more and 0.6% by mass or less, Al: 0.5% by mass or less (including 0% by mass), and balance being T and inevitable impurities.

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First Claim