US 12,080,455 B2
Sm—Fe—N-based magnetic material and manufacturing method thereof
Daisuke Ichigozaki, Toyota (JP); Tetsuya Shoji, Susono (JP); Noritsugu Sakuma, Mishima (JP); Akihito Kinoshita, Mishima (JP); and Masaaki Ito, Anjo (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Sep. 15, 2021, as Appl. No. 17/475,944.
Claims priority of application No. 2020-159860 (JP), filed on Sep. 24, 2020.
Prior Publication US 2022/0093297 A1, Mar. 24, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H01F 1/059 (2006.01); C22C 38/00 (2006.01); C22C 38/10 (2006.01); C23C 8/26 (2006.01); H01F 41/02 (2006.01)
CPC H01F 1/059 (2013.01) [C22C 38/001 (2013.01); C22C 38/005 (2013.01); C22C 38/105 (2013.01); C23C 8/26 (2013.01); H01F 41/0253 (2013.01); C22C 2202/02 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An Sm—Fe—N-based magnetic material comprising a main phase having at least any one of Th2Zn17 type and Th2Ni17 type crystal structures, wherein:
the main phase has a composition represented by a molar ratio formula (Sm(1-x-y-z)LaxCeyR1z)2(Fe(1-p-q-s)CopNiqMs)17Nh where, R1 is one or more rare earth elements other than Sm, La, and Ce, and Zr, M is one or more elements other than Fe, Co, Ni, and a rare earth element, and an unavoidable impurity element, and 0.08≤x+y≤0.50, 0≤z≤0.02, 0≤p+q≤0.10, 0≤s≤0.10, and 2.9≤h≤3.1 are satisfied;
a crystal lattice volume of the main phase is 0.833 nm3 to 0.838 nm3; and
a density of the main phase is 7.30 g/cm3 to 7.70 g/cm3.