Toyota Jidosha Kabushiki Kaisha

Kurima Kobayashi

Akira Kato

Noritsugu Sakuma

Masao Yano

Shunji Suzuki

Akira Manabe

Masaaki Ito

Hidefumi Kishimoto

Kota Washio

A magnetic compound represented by the formula (RR)(FeCo)TMwherein Ris one or more elements selected from the group consisting of Sm, Pm, Er, Tm and Yb, Ris one or more elements selected from the group consisting of Zr, La, Ce, Pr, Nd, Eu, Gd, Tb, Dy, Ho and Lu, T is one or more elements selected from the group consisting of Ti, V, Mo, Si and W, M is one or more elements selected from the group consisting of unavoidable impurity elements, Al, Cr, Cu, Ga, Ag and Au, 0&#x2264;x&#x2264;0.7, 0&#x2264;y&#x2264;0.7, 4&#x2264;a&#x2264;20, b=100-a-c-d, 0&#x3c;c&#x3c;7.7, and 0&#x2264;d&#x2264;3, the magnetic compound having a ThMn-type crystal structure, wherein the volume fraction of &#x3b1;-(Fe, Co) phase is less than 12.3%.

Magnetic compound and production method thereof

Provided is a magnetic compound represented by the formula (RZr)(FeCo)TMA(wherein R represents one or more rare earth elements, T represents one or more elements selected from the group consisting of Ti, V, Mo, and W, M represents one or more elements selected from the group consisting of unavoidable impurity elements, Al, Cr, Cu, Ga, Ag, and Au, A represents one or more elements selected from the group consisting of N, C, H, and P, 0&#x2264;x&#x2264;0.5, 0&#x2264;y&#x2264;0.6, 4&#x2264;a&#x2264;20, b=100&#x2212;a&#x2212;c&#x2212;d, 0&#x3c;c&#x3c;7, 0&#x2264;d&#x2264;1, and 1&#x2264;e&#x2264;18), in which a main phase of the magnetic compound includes a ThMntype crystal structure, and a volume percentage of an &#x3b1;-(Fe,Co) phase is 20% or lower.

Magnetic compound and method of producing the same

A rare earth magnet having a main phase and a sub-phase, wherein the main phase has a ThMn-type crystal structure; the sub-phase contains at least any one of an SmFe-based phase, an SmCo-based phase, an SmO-based phase, and an SmCu-based phase; assuming that the volume of the rare earth magnet is 100%, the volume fraction of the sub-phase is from 2.3 to 9.5% and the volume fraction of an &#x3b1;-Fe phase is 9.0% or less; and the density of the rare earth magnet is 7.0 g/cmor more.

Rare earth magnet

Growing community of inventors

Fukuroi, Japan

Kurima Kobayashi