Title :
Structure and magnetic and magnetostrictive properties of (Tb0.7Dy0.3)0.7Pr0.3(Fe 1-xCox)1.85 (0⩽×⩽0.6)
Author :
Guo, Z.J. ; Busbridge, S.C. ; Wang, B.W. ; Zhang, Z.D. ; Zhao, X.G.
Author_Institution :
Inst. of Metal Res., Acad. Sinica, Shenyang, China
fDate :
7/1/2001 12:00:00 AM
Abstract :
Measurements of the structure, magnetic properties, and magnetostriction were made on arc-melted polycrystalline (Tb0.7 Dy0.3)0.7Pr0.3(Fe1-xCo x)1.85 (0⩽×⩽0.6) alloys by X-ray diffraction, initial susceptibility, vibrating sample magnetometry, and standard strain gauge techniques. The measurements showed that the matrix of (Tb0.7Dy0.3)0.7Pr0.3 (Fe1-xCox)1.85 predominantly consists of the MgCu2-type cubic Laves phase, with a small amount of PuNi3-type and rare-earth rich phases. The amount of (Tb,Dy,Pr)(Fe,Co)2 in (Tb0.7Dy0.3) 0.7Pr0.3(Fe1-xCox)1.85 increases with increasing Co concentration and becomes almost the only phase present when x⩾0.4. The lattice parameter decreases approximately linearly with increasing x from 0.7357 nm when x=0 to 0.7300 nm when x=0.6. The Curie temperature increases with increasing x from 640 K when x=0 to 677 K when x=0.3, and then decreases to 572 K when x=0.6. The saturation magnetization Ms exhibits a minimum near x=0.3. The polycrystalline magnetostriction of (Tb0.7 Dy0.3)0.7Pr0.3(Fe1-xCo x)1.85 decreases monotonically with increasing x. There is no evidence of an anomalously large λ100 value as is the case for other R(Fe1-xCox)2 compounds
Keywords :
Curie temperature; X-ray diffraction; cobalt alloys; crystal structure; dysprosium alloys; ferromagnetic materials; iron alloys; lattice constants; magnetic susceptibility; magnetisation; magnetostriction; praseodymium alloys; terbium alloys; (Tb0.7Dy0.3)0.7Pr0.3 (Fe1-xCox)1.85; (TbDy)0.7Pr0.3(FeCo)1.85; Curie temperature; X-ray diffraction; arc melted polycrystalline alloy; crystal structure; cubic Laves phase; initial susceptibility; lattice parameter; magnetic properties; magnetostriction; saturation magnetization; strain gauge; vibrating sample magnetometry; Cobalt alloys; Iron alloys; Magnetic properties; Magnetic susceptibility; Magnetostriction; Measurement standards; Saturation magnetization; Strain measurement; Vibration measurement; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
