TY - JOUR
T1 - The Co-doped Tb0.36Dy0.64Fe2 magnetostrictive alloys with a wide operating temperature range
AU - Ma, Tianyu
AU - Jiang, Chengbao
AU - Xu, Xiang
AU - Zhang, Hu
AU - Xu, Huibin
PY - 2005/4
Y1 - 2005/4
N2 - Magnetostrictive alloys with a wide operating temperature range from -80 to 150 °C were developed by changing the Tb/Dy ratio of TbxDy 1-xFe2 from 0.3/0.7 to 0.36/0.64 and Co partly substituting for Fe. The structure, Curie temperature, AC susceptibility, magnetization, magnetocrystalline anisotropy constant K1 and magnetostriction of Tb0.36Dy0.64(Fe1- yCoy)2 (y=0.0, 0.1, 0.2) alloys were investigated. It was found that the matrix of Tb0.36Dy 0.64(Fe1-yCoy)2 alloys keeps the MgCu2-type cubic Laves structure with a small amount of R-rich phase. A small amount of R2(Fe,Co) phase was also detected when y=0.2. The Curie temperature Tc of Tb0.36Dy 0.64(Fe1-yCoy)2 alloys is higher than Tb0.3Dy0.7Fe2 and increases drastically with increasing Co content from 387.1°C for Tb 0.36Dy0.64Fe2 to 416.7°C for Tb 0.36Dy0.64(Fe0.9Co0.1)2 and 433.3°C for Tb0.36Dy0.64(Fe0.8Co 0.2)2. The spin reorientation temperature Tr decreases from -12°C for Tb0.3Dy0.7Fe2 to -94°C for Tb0.36Dy0.64Fe2. It increases slightly with increasing Co content. The magnetocrystalline anisotropy coefficient K1 of Tb0.36Dy0.64(Fe 1-yCoy)2 alloys is greater than Tb0.3Dy0.7Fe2 but decreases with increasing Co content. The saturation magnetization Ms of Co-doped alloys is lower than that of Tb0.3Dy0.7Fe2 and decreases with increasing Co content. The magnetostriction of Tb0.3Dy 0.7Fe2 and Tb0.36Dy0.64(Fe 1-yCoy)2 alloys was examined against applied magnetic field up to 5 kOe in the temperature range from -80 to 150°C.The temperature coefficient of magnetostriction (Δλ/ ΔT) of Tb0.3Dy0.7Fe2 and Tb 0.36Dy0.64(Fe1-yCoy) 2 alloys was also calculated by linearly simulating the magnetostriction-temperature curve, showing that the absolute value of Δλ/ΔT at 5 kOe magnetic field is 1.17 ppm/°C for y=0.1 and 1.35 ppm/°C for y=0.2, smaller than that of Co free samples, which is 2.43 ppm/°C for Tb0.36Dy0.64Fe2.
AB - Magnetostrictive alloys with a wide operating temperature range from -80 to 150 °C were developed by changing the Tb/Dy ratio of TbxDy 1-xFe2 from 0.3/0.7 to 0.36/0.64 and Co partly substituting for Fe. The structure, Curie temperature, AC susceptibility, magnetization, magnetocrystalline anisotropy constant K1 and magnetostriction of Tb0.36Dy0.64(Fe1- yCoy)2 (y=0.0, 0.1, 0.2) alloys were investigated. It was found that the matrix of Tb0.36Dy 0.64(Fe1-yCoy)2 alloys keeps the MgCu2-type cubic Laves structure with a small amount of R-rich phase. A small amount of R2(Fe,Co) phase was also detected when y=0.2. The Curie temperature Tc of Tb0.36Dy 0.64(Fe1-yCoy)2 alloys is higher than Tb0.3Dy0.7Fe2 and increases drastically with increasing Co content from 387.1°C for Tb 0.36Dy0.64Fe2 to 416.7°C for Tb 0.36Dy0.64(Fe0.9Co0.1)2 and 433.3°C for Tb0.36Dy0.64(Fe0.8Co 0.2)2. The spin reorientation temperature Tr decreases from -12°C for Tb0.3Dy0.7Fe2 to -94°C for Tb0.36Dy0.64Fe2. It increases slightly with increasing Co content. The magnetocrystalline anisotropy coefficient K1 of Tb0.36Dy0.64(Fe 1-yCoy)2 alloys is greater than Tb0.3Dy0.7Fe2 but decreases with increasing Co content. The saturation magnetization Ms of Co-doped alloys is lower than that of Tb0.3Dy0.7Fe2 and decreases with increasing Co content. The magnetostriction of Tb0.3Dy 0.7Fe2 and Tb0.36Dy0.64(Fe 1-yCoy)2 alloys was examined against applied magnetic field up to 5 kOe in the temperature range from -80 to 150°C.The temperature coefficient of magnetostriction (Δλ/ ΔT) of Tb0.3Dy0.7Fe2 and Tb 0.36Dy0.64(Fe1-yCoy) 2 alloys was also calculated by linearly simulating the magnetostriction-temperature curve, showing that the absolute value of Δλ/ΔT at 5 kOe magnetic field is 1.17 ppm/°C for y=0.1 and 1.35 ppm/°C for y=0.2, smaller than that of Co free samples, which is 2.43 ppm/°C for Tb0.36Dy0.64Fe2.
KW - Co substitution
KW - Magnetostriction
KW - Rare-earth transition-metal alloys
UR - https://www.scopus.com/pages/publications/15844388735
U2 - 10.1016/j.jmmm.2004.11.147
DO - 10.1016/j.jmmm.2004.11.147
M3 - 文章
AN - SCOPUS:15844388735
SN - 0304-8853
VL - 292
SP - 317
EP - 324
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
ER -