Thermal and magnetic effects in quasi-binary Tb1-xDyxNi2 (x=0.25, 0.5, 0.75) intermetallics

被引：20

作者：

Cwik, J. ^{[1
]}

Koshkid'ko, Y. ^{[1
]}

Kolchugina, N. ^{[2
]}

Nenkov, K. ^{[3
]}

de Oliveira, N. A. ^{[4
]}

机构：

[1] PAS, Inst Low Temp & Struct Res, PL-50950 Wroclaw, Poland

[2] RAS, Baikov Inst Met & Mat Sci, Moscow 119991, Russia

[3] IFW Dresden, Inst Metall Mat, D-01171 Dresden, Germany

[4] Univ Estado Rio de Janeiro, Inst Fis Armando Dias Tavares, Rua Sao Francisco Xavier 524, BR-20550013 Rio De Janeiro, RJ, Brazil

来源：

ACTA MATERIALIA | 2019年 / 173卷

关键词：

Heat capacity; Magnetocaloric effect; Laves phase; Adiabatic temperature change; The second-order phase transitions; HEAT; CRYSTAL; FIELDS;

D O I：

10.1016/j.actamat.2019.04.056

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Measurements of the low-temperature heat capacity performed for the polycrystalline Tb1-xDyxNi2 intermetallic compounds with x = 0.25, 0.5 and 0.75 enable us to determine their Debye temperatures and estimate the lattice, electron and magnetic contributions to the heat capacity. The measurements in magnetic fields of 1 and 2T were performed to find the isothermal magnetic entropy and adiabatic temperature changes which characterize the magnetocaloric effect of these compounds. The experimental data obtained are paralleled by theoretical calculations performed in the frame of a microscopic model, which takes into account the exchange interaction and the crystal electric field anisotropy. For the Tb0.75DY0.25Ni2 compound, direct measurements of the adiabatic temperature change in the temperature range of the magnetic transition were carried out in magnetic fields up to 14T. The found regularities are discussed in terms of Landau's theory of second-order magnetic phase transitions. In addition, for the parent binary compound, TbNi2, the change of emitted (absorbed) quantity of heat Delta Q was determined using direct measurements. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：27 / 33

页数：7

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