Persistent values of magnetocaloric effect in the multicomponent Laves phase compounds with varied composition

Chzhan, V. B.; Терешина, И. С.; Karpenkov, A. Yu.; Tereshina-Chitrova, E. A.

doi:10.1016/j.actamat.2018.05.053

Cited by 45 publications

(6 citation statements)

References 43 publications

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“…5b, the largest ΔTad of about 1.1 K is achieved for ΔB = 1.1 T, which is reversible during the field oscillations. Although lower than the values obtained for the famous (Mn,Fe)2(P,Si), La(Fe,Si)13-based alloys and pure Gd, the measured values of ΔTad are larger than the reversible values in the MnMX family for a first-order MST under the same field change [19,34], and are comparable with those in the Ni-Mn-based Heusler alloys, Mn2Sb-based alloys, (Hf,Ta)Fe2-based alloys and Tbx(Dy0.5Ho0.5)1-xCo2 compounds at the first-order magnetic transition [35][36][37][38]. Additionally, the smooth magnetic transition results in a wider working temperature range for the MCE of about 30 K, as estimated by the full width at the half maximum in ΔTad versus temperature presented in Fig.…”

Section: Magnetocaloric Performancementioning

confidence: 53%

Design of Reversible Low-Field Magnetocaloric Effect at Room Temperature in Hexagonal MnMX Ferromagnets

You

Batashev

et al. 2020

Phys. Rev. Applied

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Giant magnetocaloric effect is widely achieved in hexagonal MnMX-based (M = Co or Ni, X = Si or Ge) ferromagnets at their first-order magnetostructural transition.However, the thermal hysteresis and the low sensitivity of the magnetostructural transition to the magnetic field inevitably lead to a sizeable irreversibility of the lowfield magnetocaloric effect. In this work, we show an alternative way to realize a reversible low-field magnetocaloric effect in MnMX-based alloys by taking advantage of the second-order phase transition. With introducing Cu into Co in MnCoGe alloy, the martensitic transition is stabilized at high temperature, while the Curie temperature of the orthorhombic phase is reduced to room temperature. As a result, a second-order magnetic transition with negligible thermal hysteresis and a large magnetization change can be observed, enabling a large reversible magnetocaloric effect. By both calorimetric and direct measurements, a reversible adiabatic temperature change of about 1 K is obtained under a field change of 0-1 T at 304 K, which is larger than that obtained in a first-order magnetostructural transition. To get a better insight into the origin of these experimental results, first-principles calculations are carried out to characterize the chemical bonds and the magnetic exchange interaction. Our work provides a new understanding of the MnCoGe alloy and indicates a feasible route to improve the reversibility of the low-field magnetocaloric effect in the MnMX system.

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Section: Magnetocaloric Performancementioning

confidence: 53%

Design of Reversible Low-Field Magnetocaloric Effect at Room Temperature in Hexagonal MnMX Ferromagnets

You

Batashev

et al. 2020

Phys. Rev. Applied

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“…Как уже отмечалось выше, основными функциональными свойствами соединений RCo 2 являются гигантская магнитострикция и магнитокалорический эффект, которые проявляются в области температуры Кюри [5][6][7]33,34]. Для исходных соединений Tb 0.3 Dy 0.7 Co 2 и TbCo 2 , демонстрирующих переход первого и второго рода, соответственно, эти функциональные свойства подробно исследованы в работе [5].…”

Section: результаты и обсуждениеunclassified

“…Материалы на основе RCo 2 могут демонстрировать мультифункциональные свойства (такие как магнитострикционный, магнитокалорический и др. эффекты) и могут использоваться в различных областях науки и техники [3][4][5][6][7]. Нередко данные материалы эксплуатируются в водородсодержащих средах.…”

Section: Introductionunclassified

Влияние гидрирования на структуру, магнитные и магнитокалоричеcкие свойства сплавов Tb-Dy-Co со структурой фаз Лавеса

Терёшина¹,

Каминская²,

Chzhan³

et al. 2019

Физика Твердого Тела

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A comprehensive study of the structure, phase composition, surface topology, magnetic and magnetocaloric properties of the compounds TbCo2, Tb0.3Dy0.7Co2 and the hydride with a low hydrogen content Tb0.3Dy0.7Co2H0.5 was carried out. The features of the structure at the micro- and nano- levels, as well as changes in the fundamental and functional properties during hydrogenation, were established. It was shown that the introduction of a small amount of hydrogen into the crystal lattice of the Tb0.3Dy0.7Co2 compound leads to an increase in both the Curie temperature and the magnetic moment on the cobalt atoms. The type of magnetic phase transition from a paramagnetic to a magnetically ordered state changes from the first (in the compound Tb0.3Dy0.7Co2) to the second (in TbCo2, Tb0.3Dy0.7Co2H0.5), which leads to a significant decrease in the magnitude of the magnetocaloric effect.

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“…They exhibit localized magnetism of the R sublattice resulting in a large magnetic anisotropy and magnetostriction and itinerant magnetism of the 3d sublattice which, in the case of Fe and Co, provides a high magnetic moment and Curie temperature (T c ). Several excellent materials for application as permanent magnets and magnetostrictors have been discovered [6][7][8], thus making Laves phases very interesting research objects from both the scientific and applications viewpoints. For compounds with Ni, on the other hand, no magnetic moment at the nickel atoms is observed, and the magnetic interaction involves only the R sublattice [9,10].…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Magnetothermodynamics Performance of Tb1-xErxNi2 Laves-Phases Compounds for Designing Composite Refrigerants

et al. 2022

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In this paper, the results of heat capacity measurements performed on the polycrystalline Tb1-xErxNi2 intermetallic compounds with x = 0.25, 0.5 and 0.75 are presented. The Debye temperatures and lattice contributions as well as the magnetic part of the heat capacity were determined and analyzed. The heat capacity measurements reveal that the substitution of Tb atoms for Er atoms leads to a linear reduction of the Curie temperatures in the investigated compounds. The ordering temperatures decrease from 28.3 K for Tb0.25Er0.75Ni2 to 12.9 K for Tb0.75Er0.25Ni2. Heat capacity measurements enabled us to calculate with good approximation the isothermal magnetic entropy ΔSmag and adiabatic temperature changes ΔTad for Tb1-xErxNi2, for the magnetic field value equal to 1 T and 2 T. The optimal molar ratios of individual Tb0.75Er0.25Ni2, Tb0.5Er0.5Ni2 and Tb0.25Er0.75Ni2 components in the final composite were theoretically determined. According to the obtained results, the investigated composites make promising candidates that can find their application as an active body in a magnetic refrigerator performing an Ericsson cycle at low temperatures. Moreover, for the Tb0.5Er0.5Ni2 compound, direct measurements of adiabatic temperature change in the vicinity of the Curie temperature in the magnetic field up to 14 T were performed. The obtained high-field results are compared to the data for the parent TbNi2 and ErNi2 compounds, and their magnetocaloric properties near the Curie temperature are analyzed in the framework of the Landau theory for the second-order phase transitions.

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Persistent values of magnetocaloric effect in the multicomponent Laves phase compounds with varied composition

Cited by 45 publications

References 43 publications

Design of Reversible Low-Field Magnetocaloric Effect at Room Temperature in Hexagonal MnMX Ferromagnets

Design of Reversible Low-Field Magnetocaloric Effect at Room Temperature in Hexagonal MnMX Ferromagnets

Влияние гидрирования на структуру, магнитные и магнитокалоричеcкие свойства сплавов Tb-Dy-Co со структурой фаз Лавеса

Low-Temperature Magnetothermodynamics Performance of Tb1-xErxNi2 Laves-Phases Compounds for Designing Composite Refrigerants

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