Existence and properties of Co-rich 3:29-type of compounds synthesized with heavy rare eart

Existence and properties of Co-rich 3:29-type of compounds synthesized with heavy rare earths
Journal of Magnetism and Magnetic Materials Volume 316, Issue 2, September 2007, Pages e458-e461Proceedings of the Joint European Magnetic Symposia
K.G. Efthimiadisa, Corresponding Author Contact Information, E-mail The Corresponding Author, C. Sarafidisa, M. Gjokab and O. Kalogiroua
a Department of Physics, Aristotle University of Thessaloniki, 54 124 Thessaloniki, Greece
b Institute for Materials Science, NCSR “Demokritos”, 15 310 Ag. Paraskevi, Attiki, Greece
Available online 3 March 2007.
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Abstract
In this work, the synthesis and the study of rare earth–transition metal intermetallic compounds with nominal stoichiometry R3(Fe1−xCox)29−yCry (R=Tb, Ho and (x, y)=(0.6, 4.5) and (0.8, 5.5)) is presented. The compounds were synthesized with the typical arc-melting technique from high-purity constituents and subsequently annealed at various temperatures. Both series were found to produce practically single-phase samples after the annealing procedure with a significant difference in crystal structure. For R=Tb, the monoclinic 3:29 phase (Nd3(Fe, Ti)29-type, space group A2/m) is produced, while for R=Ho, a disordered variant of the hexagonal 2:17 phase (Th2Ni17-type, space group P63/mmc) occurs. The magnetic interactions for the samples with x=0.8 are generally weaker than those with less Co, especially in the case of R=Ho. The magnetocrystalline anisotropy of all the compounds has a planar character.
Keywords: R–TM intermetallic; Magnetically ordered material; Powder metallurgy