Abstract
The effects of partial substitution of dysprosium in Tb0.2Dy0.8Co2 by terbium and gadolinium on the structure and magnetic properties have been studied. Two compositions, Tb0.3Dy0.7Co2 and Tb0.2Dy0.7Gd0.1Co2 have been synthesized. Their crystal structure, in contrast to the structure of the original compound, has both tetragonal distortions and rhombohedral distortions at lower temperatures. Anomalies of magnetostriction and magnetocaloric effect near the observed magnetic phase transitions have been studied. The sign-alternating temperature dependences of the longitudinal and transverse magnetostrictions associated with various types of crystal structure distortions of the alloys are revealed.
Highlights
The rare earth Laves phases RCo2 with cubic MgCu2-type structure (C15) exhibit a number of interesting effects such as large magnetovolume effect, significant anisotropic magnetostriction, and large magnetocaloric effect [1,2,3,4]
The sign-alternating temperature dependences of the longitudinal and transverse magnetostrictions associated with various types of crystal structure distortions of the alloys are revealed
The special symmetry of the cubic Laves phase leads to a significant rhombohedral distortion in the (111) direction in the magnetic state
Summary
The rare earth Laves phases RCo2 with cubic MgCu2-type structure (C15) exhibit a number of interesting effects such as large magnetovolume effect, significant anisotropic magnetostriction, and large magnetocaloric effect [1,2,3,4]. The special symmetry of the cubic Laves phase leads to a significant rhombohedral distortion in the (111) direction in the magnetic state. The metamagnetic transitions in DyCo2 and GdCo2 cause a crystal symmetry reduction from the cubic (paramagnetic) to a tetragonal (ferrimagnetic) structure [5,6]. In the system of binary compounds based on (TbxDy1-x)Co2, at x ≤ 0.2, the distortions are tetragonal, and for x> 0.2, rhombohedral [7]. In the system of binary compounds based on (TbxGd1-x)Co2, for x ≤ 0.9, the distortions are tetragonal, and for x > 0.9, the distortions are rhombohedral [8]
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