TY - JOUR
T1 - Intrinsic magnetic properties of (Sm,Gd)Fe12-based compounds with minimized addition of Ti
AU - Tozman, P.
AU - Sepehri-Amin, H.
AU - Ohkubo, T.
AU - Hono, K.
N1 - Funding Information:
This work was supported by Elements Strategy Initiative Center for Magnetic Materials (ESICMM), Grant Number JPMXP0112101004, through the Ministry of Education, Culture, Sports, Science and Technology ( MEXT ).
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/2/25
Y1 - 2021/2/25
N2 - SmFe12-based compounds with the ThMn12 type structure are considered to be potential candidates for rare-earth-lean permanent magnets; however, their poor phase stability has hindered practical application. In this work, the effects of Gd on the phase stability of the ThMn12 structure and the elimination of α-Fe for (Sm0.8Gd0.2)(Fe0.8Co0.2)12-xTix (x = 0.5, 0.6, 0.65, 0.75, 0.85, and 1) compounds are investigated. A single 1:12 phase was obtained for (Sm0.8Gd0.2)(Fe0.8Co0.2)11.25Ti0.75 compound with excellent intrinsic magnetic properties at 300 K with saturation magnetization, μ0Ms = 1.46 T, anisotropy field, μ0Ha = 9.24 T, and Curie temperature, Tc = 816 K. Unlike the Gd-free sample, the rapid decay of μ0Ms and μ0Ha at elevated temperatures was hindered for the Gd-doped sample; this originated from the hybridization between 5d orbitals of Gd and 3d orbitals of Fe along with the increase in magnetic coupling between the rare earth (RE) and Fe sublattices. (Sm0.8Gd0.2)(Fe0.8Co0.2)11.25Ti0.75 has a higher magnetic anisotropy field above 400 K compared with those of the previously reported SmFe12-based compounds Sm(Fe0.8Co0.2)11Ti1 and (Sm0.8Zr0.2)(Fe0.8Co0.2)11.5Ti0.5 and Nd2Fe14B compound.
AB - SmFe12-based compounds with the ThMn12 type structure are considered to be potential candidates for rare-earth-lean permanent magnets; however, their poor phase stability has hindered practical application. In this work, the effects of Gd on the phase stability of the ThMn12 structure and the elimination of α-Fe for (Sm0.8Gd0.2)(Fe0.8Co0.2)12-xTix (x = 0.5, 0.6, 0.65, 0.75, 0.85, and 1) compounds are investigated. A single 1:12 phase was obtained for (Sm0.8Gd0.2)(Fe0.8Co0.2)11.25Ti0.75 compound with excellent intrinsic magnetic properties at 300 K with saturation magnetization, μ0Ms = 1.46 T, anisotropy field, μ0Ha = 9.24 T, and Curie temperature, Tc = 816 K. Unlike the Gd-free sample, the rapid decay of μ0Ms and μ0Ha at elevated temperatures was hindered for the Gd-doped sample; this originated from the hybridization between 5d orbitals of Gd and 3d orbitals of Fe along with the increase in magnetic coupling between the rare earth (RE) and Fe sublattices. (Sm0.8Gd0.2)(Fe0.8Co0.2)11.25Ti0.75 has a higher magnetic anisotropy field above 400 K compared with those of the previously reported SmFe12-based compounds Sm(Fe0.8Co0.2)11Ti1 and (Sm0.8Zr0.2)(Fe0.8Co0.2)11.5Ti0.5 and Nd2Fe14B compound.
KW - Magnetic anisotropy field
KW - Permanent magnet
KW - SmFe
KW - ThMn structure
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U2 - 10.1016/j.jallcom.2020.157491
DO - 10.1016/j.jallcom.2020.157491
M3 - Article
AN - SCOPUS:85092442758
SN - 0925-8388
VL - 855
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 157491
ER -