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A rare earth magnet including a magnetic phase having the composition represented by (Nd(1−x−y)LaxCey)2(Fe(1−z)Coz)14B. When the saturation magnetization at absolute zero and the Curie temperature calculated by Kuzmin's formula based on the measured values at finite temperature and the saturation magnetization at absolute zero and the Curie temperature calculated by first principles calculation are respectively subjected to data assimilation. The saturation magnetization M(x, y, z, T=0) at absolute zero and the Curie temperature obtained by machine learning using the assimilated data group are applied again to Kuzmin's formula and the saturation magnetization at finite temperature is represented by a function M(x, y, z, T), x, y, and z of the formula in an atomic ratio are in a range of satisfying M(x, y, z, T)>M(x, y, z=0, T) and 400≤T≤453.

Titel:	Rare earth magnets
Autor/in / Beteiligte Person:	TOYOTA JIDOSHA KABUSHIKI, KAISHA ; THE UNIVERSITY OF, TOKYO
Link:	View record in USPTO Patent Grants (Volltext)
Veröffentlichung:	2023
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Grants Sprachen: English Patent Number: 11721,479 Publication Date: August 08, 2023 Appl. No: 17/000796 Application Filed: August 24, 2020 Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA (Toyota, JP), THE UNIVERSITY OF TOKYO (Tokyo, JP) Claim: 1. A rare earth sintered magnet comprising a single-phase magnetic phase that is prepared by sintering a magnetic powder comprising the single-phase magnetic phase, the single-phase magnetic phase in the magnetic powder having a size in the range of from 1 to 500 μm and having the composition represented by the formula (Nd (1−x−y) La x Ce y) 2 (Fe (1−z) Co z) 14 B in an atomic ratio, wherein x, y, and z in the formula in an atomic ratio satisfy a relationship represented by the following formulas (1) to (3), and a material parameters of the following formula (1) is 0.60, [mathematical expression included] μ 0 : vacuum permeability (N/A 2) M(x,y,z,T): saturation magnetization at finite temperature (T) M(x,y,z,T=0): saturation magnetization at absolute zero (T) s: material parameter (−) T: finite temperature (KS) T c : Curie temperature (K) μ 0 M (x,y,z,T= 0)=1.799−0.411 x −0.451 y −0.593 z −0.011 x 2 +0.002 y 2 −0.070 z 2 −0.002 xy− 0.058 yz −0.040 zx Formula (2) μ 0 : vacuum permeability (N/A 2) M(x,y,z,T=0): saturation magnetization at absolute zero (T) T c (x,y,z)=588.894−5.825 x −135.713 y +506.799 z +1.423 x 2 +10.016 y 2 −69.174 z 2 +125.862 xy +15.110 yz −12.342 zx Formula (3) wherein z in the formula in an atomic ratio satisfies 0.30≤z≤0.40, wherein x and y in the formula in an atomic ratio satisfy 0.03≤x≤0.50 and 0.03≤y ≤0.50, respectively, and wherein the value represented by M(x, y, z, T=453)−M(x, y, z=0, T=453) is 0.02 to 0.24. Claim: 2. The rare earth magnet according to claim 1 , wherein a volume fraction of the magnetic phase is 90.0 to 99.0% relative to the entire rare earth magnet and the remaining balance is a grain boundary phase. Patent References Cited: 4765848 August 1988 Mohri ; 20050268989 December 2005 Tomizawa ; 20180182519 June 2018 Ito ; 109979699 July 2019 ; 3 522 178 August 2019 Other References: Lin (Journal of Magnetism and Magnetic Materials, vol. 490, 2019, No. 165454, Published on Jun. 12, 2019). (Year: 2019). cited by examiner ; Wecker (Applied Physics Letters, vol. 51, 1987, p. 697-699). (Year: 1987). cited by examiner ; Eric J. Skoug, et al., “Crystal structure and magnetic properties of Ce2Fe14—xCoxB alloys”, Journal of Alloys and Compounds, vol. 574, (2013), pp. 552-555. cited by applicant ; Takashi Miyake, et al., “First-Principles Study of Magnetocrystalline Anisotropy and Magnetization in NdFe12, NdFe11Ti, and NdFe11TiN”, Journal of the Physical Society of Japan, vol. 83, (2014), pp. 043702-1-043702-4. cited by applicant Primary Examiner: Su, Xiaowei Attorney, Agent or Firm: Oliff PLC

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Rare earth magnets