Abstract
In this paper the results of magnetic properties study for a series samples of R(Co0.88Fe0.12)2 type intermetallic compounds with a heavy rare-earth elements (R = Gd, Tb, Dy, Ho, Er) are presented. Such materials having a plateau-like temperature dependences of magnetic entropy change in the temperature range lower Curie point are considered as a promising functional materials for magnetic refrigerators. Their phase composition was controlled by X-ray diffraction analysis with a help of Bruker D8 Advance diffractometer. Magnetic field magnetization dependences – M(H) were measured using a SQUID magnetometer (MPMS-XL-7, Quantum Design) within the temperature range of 5 – 600 K in magnetic fields up to 5600 kA/m. The crystal lattice parameter – a, Curie temperature – TC, coercivity – Hc and residual magnetization – Mr values are analyzed as a functions of R-element atomic number. For compounds with Tb, Dy, Ho and Er the second picks on the high field susceptibility temperature dependences – χhf(T) were found in the temperature range lower their TC.
Highlights
Cubic RT2 type Laves phases, where R – Rare Earth element, T – 3d transition metal (Fe, Co, Ni) are actively studied from the middle of the XX century because a some of them on the Fe-base possess a great anisotropic magnetostriction values [1].Binary compounds on the Co-base have an interest due to the large magnetocaloric effect – MCE in the vicinity of their Curie point – TC [2]
Such materials having a plateau-like temperature dependences of magnetic entropy change in the temperature range lower Curie point are considered as a promising functional materials for magnetic refrigerators
The MCE studies in the quasi-binary R(Co1-xFex)2 compounds with a heavy R have shown that a partial Co substitution with Fe leads to the emergence of significant MCE in a wide temperature range below its TC [5]
Summary
Cubic RT2 type Laves phases, where R – Rare Earth element, T – 3d transition metal (Fe, Co, Ni) are actively studied from the middle of the XX century because a some of them on the Fe-base possess a great anisotropic magnetostriction values [1].Binary compounds on the Co-base have an interest due to the large magnetocaloric effect – MCE in the vicinity of their Curie point – TC [2]. In this paper the results of magnetic properties study for a series samples of R(Co0.88Fe0.12)2 type intermetallic compounds with a heavy rare-earth elements (R = Gd, Tb, Dy, Ho, Er) are presented. The crystal lattice parameter – a, Curie temperature – TC, coercivity – Hc and residual magnetization – Mr values are analyzed as a functions of Relement atomic number.
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