Magnetocaloric and Magnetostrictive Properties of the Tb(Co,In)2 Laves Phases

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Resumo

Multicomponent polycrystalline TbInxCo2–x (with х = 0–0.2) solid solutions are prepared for the first time, and their crystal structure and magnetic, magnetocaloric, and magnetostrictive properties are studied. X-ray diffraction patterns taken at room temperature demonstrate mainly the presence of the cubic C15 Laves phase in all samples. As the indium content increases to x = 0.1, the lattice parameter is found to increase; the further increase in the indium content to х = 0.2 leads to a decrease in the lattice parameter. In this case, the Curie temperature TC monotonically increases to 245 K. The isotheral magnetic entropy change ΔSmag is calculated in accordance with magnetic measurements using the thermodynamic Maxwell’s relation. At a magnetic field change from 0 to 1.8 T, the maximum entropy change monotonically decreases and, for composition with x = 0.2, is 1.8 J/(kg∙К). As the indium content increases to x = 0.05, the volume magnetostriction increases. The further increase in the indium concentration leads to the decrease in the peak values and their shift to high temperatures.

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Sobre autores

D. Morozov

Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: morozoww96@mail.ru
Rússia, Moscow

G. Politova

Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences; Peter the Great Saint Petersburg Polytechnic University

Email: morozoww96@mail.ru
Rússia, Moscow; Saint Petersburg

M. Ganin

Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences

Email: morozoww96@mail.ru
Rússia, Moscow

M. Politov

Bauman Moscow State Technical University

Email: morozoww96@mail.ru
Rússia, Moscow

A. Mikhailova

Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences

Email: morozoww96@mail.ru
Rússia, Moscow

A. Filimonov

Peter the Great Saint Petersburg Polytechnic University

Email: morozoww96@mail.ru
Rússia, Saint Petersburg

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2. Fig. 1. Room temperature diffraction spectra for TbInxCo2-x (x = 0, 0.05, 0.1, 0.15, 0.2). Numbers indicate the reflections corresponding to the cubic structure of C15

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3. Fig. 2. Specific magnetisation hysteresis loops for TbInxCo2-x (x = 0, 0.05, 0.1, 0.15, 0.2), inset: enlarged fragment (a), and specific magnetisation isotherms of TbIn0.2Co1.8 measured at different temperatures (b)

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4. Fig. 3. Temperature dependences of magnetisation, inset: temperature dependence of the temperature derivative of specific magnetisation at μ0H = 0.05 Tesla (a) and Belov-Arrott curves for solid solution TbIn0.2Co1.8 (b)

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5. Fig. 4. Temperature dependences of the change in the magnetic part of entropy ΔSmag for TbIn0.2Co1.8 near the ordering temperature, inset: field dependence of -ΔSmag (a), and TbInxCo2-x compositions (x = 0, 0.05, 0.1, 0.15, 0.2) at maximum magnetic field change up to 1.8 Tesla (b)

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6. Fig. 5. Temperature dependences of longitudinal (a) and transverse (b) magnetostriction of the alloy TbIn0.15Co1.85

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7. Fig. 6. Field dependences of longitudinal and transverse magnetostriction of TbInxCo2-x compositions (x = 0, 0.05, 0.1, 0.15, 0.2) at 100 K

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8. Fig. 7. Field dependences of bulk magnetostriction of TbInxCo2-x compositions (x = 0, 0.05, 0.1, 0.15, 0.2) at Curie temperature

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9. Fig. 8. Temperature dependences of the bulk magnetostriction of TbInxCo2-x compositions (x = 0, 0.05, 0.1, 0.15, 0.2) near the Curie temperature

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