Magnetocaloric effect and magnetostrictive deformation in Tb-Dy-Gd-Co-Al with Laves phase structure

• Published in: Journal of magnetism and magnetic materials 2019-01, Vol.470, p.50-54
• Main Authors: Politova, G.A., Pankratov, N.Yu, Vanina, P.Yu, Filimonov, A.V., Rudskoy, A.I., Burkhanov, G.S., Ilyushin, A.S., Tereshina, I.S.
• Format: Article
• Language: English
• Subjects: Crystal structure; Curie temperature; Deformation; Deformation effects; Dysprosium; Electric arc melting; Gadolinium; Intermetallic compounds; Laves phase; Magnetic properties; Magnetism; Magnetocaloric effect; Magnetostriction; Rare earth elements; Rare-earth intermetallic compounds; Solid phases; Temperature; X ray powder diffraction; X-ray diffraction
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2017.11.016

•Single-phase (Tb,Dy,Gd)(Co,Al)2 alloys synthesized using high-purity metals.•Temperature dependence of lattice parameters measured in a wide temperature range.•The second order magnetostructural phase transitions like Curie temperatures (from cubic to the rhombohedral phase) are found.•The magnetostrictive properties and the MCE of the Tb0.2Dy0.8−xGdxCo1.9Al0.1 (x = 0.3, 0.4, and 0.5) compounds were studied in detail.•The influence of partial substitution of Co by Al atoms on the magnetocaloric and magnetostrictive properties (Tb,Dy,Gd)Co2.•Materials with ‘table-like’ MCE are found. The influence of partial substitution of Co by Al atoms on the magnetocaloric and magnetostrictive properties of the multicomponent Tb-Dy-Gd-Co compounds with a Laves phase structure was investigated. The samples were obtained by arc melting using of high-purity rare-earth metals. The crystal structure of Tb0.2Dy0.8-xGdxCo2-yAly (x = 0.3, 0.4, and 0.5; y = 0 and 0.1) compounds was monitored by powder X-ray diffraction. The magnetostriction and the magnetocaloric effect in external magnetic field up to 12 and 18kOe, respectively, were studied in wide temperature range. The Curie temperature of Al-content compounds increases by an average of 20K, while the magnitudes of the magnetocaloric effect and the magnetostriction slightly decrease.