Magnetic and Thermomagnetic Properties of Materials Based on R(Co1 – xFex )2 Laves Phases with Heavy Rare-Earth Metals
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The crystal structure, the temperature and field dependences of the magnetization M and of the magnetic contribution into the entropy ΔSm, the temperature dependences of the high-field susceptibility χ and the heat capacity Cp of specimens of polycrystal R(Co1 – x Fex)2 compounds, where R is Gd, Dy, Ho or Er, are studied. The width of the ΔSm peak at half-height of its maximum (ΔTFWHM) is estimated. The dependences of ΔTFWHM and of the temperature behavior of ΔSm of the specimens on the magnetic field, on the iron content (x ) and on the atomic number of the element R are determined. The causes of the broadening of the ΔSm (T ) peak upon substitution of cobalt with iron in the R(Co1 – x Fex)2 compounds are considered.
Key wordsmagnetocaloric effect Laves phases heat capacity susceptibility variation of the magnetic contribution into entropy
The authors are obliged to N. V. Selezneva for the help with the x-ray diffraction analysis, to A. S. Volegov for the help with the magnetic measurements, and to M. A. Semkin for the help with processing the diffraction patterns.
The work has been performed with support of State Contract No. 3.6121.2017/8.9 concluded between the Ural Federal University and the Ministry of Education and Science of the Russian Federation.
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