Magnetocaloric effect in Laves-phase rare-earth compounds with the second-order magnetic phase transition: Estimation of the high-field properties

Ćwik, J.; Koshkid’ko, Yu. S.; Oliveira, N.A. de; Nenkov, K.; Hackemer, A.; Dilmieva, E. T.; Kolchugina, N. B.; Никитин, С.А.; Rogacki, K.

doi:10.1016/j.actamat.2017.05.054

Cited by 48 publications

(19 citation statements)

References 41 publications

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“…According to the literature, the ordering temperature spans over the range from 37 to 46 K for TbNi 2 , whereas in the case of ErNi 2 , the temperature T c is the lowest among RNi 2 compounds, ~7 K [13]. In our previous works [11,12], we estimated the ordering temperatures of ~37.1 and 6.5 K for TbNi 2 and ErNi 2 , respectively. The maximum values of ∆T ad for the magnetic field change of 2 T reach 2.5 K at 34.5 K and 3.4 K at 6.5 K for TbNi 2 and ErNi 2 compounds, respectively [11,12].…”

Section: Introductionmentioning

confidence: 96%

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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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Section: Introductionmentioning

confidence: 96%

“…Among the large group of binary RNi 2 compounds, TbNi 2 and ErNi 2 have garnered a significant interest. Their magnetic and magnetocaloric properties have been extensively explored [9][10][11][12]. These compounds are characterized by large heat capacity anomalies observed around the ordering temperatures.…”

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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“…В сплавах RM 2 (R -редкоземельный металл, M = Ni, Al) в криогенной области температур наблюдается фазовый переход ферромагнетик-парамагнетик и, как следствие, высокие значения магнитокалорического эффекта в области ферромагнитной точки Кюри [1,2]. Поэтому при создании прототипов криогенных магнитных рефрижераторов сплавы фаз Лавеса используют в качестве рабочих тел [3].…”

Section: Introductionunclassified

“…Например, в работе [7], применялось два типа термообработки отжиг при 923 K в течение 720 часов или при 1473 K в течение 15 часов, которые дали сопоставимые результаты. Также производят термообработку образца в танталовой фольге и в вакуумированной кварцевой ампуле в течение месяца при температуре 1123 K [2]. Вплоть до использования метода спинингования лент, без последующего отжига [8].…”

Section: Introductionunclassified

Гомогенизационный отжиг и магнитные свойства образца фазы Лавеса GdNi-=SUB=-2-=/SUB=-

Маширов¹,

Мусабиров²,

Аникин³

et al. 2021

Физика Твердого Тела

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The paper shows the effect of homogenization annealing on the ferromagnet-paramagnet phase transition in the GdNi2 alloy. In the cast sample, at the Curie point, a temperature hysteresis is observed, which in an external magnetic field of 13.5 T can be at least 3 degrees. The data of scanning electron microscopy of the electropolished samples showed a decrease in the impurity phase of GdNi and practically no temperature hysteresis of the phase transition in the annealed GdNi2 sample. The value of the isothermal change entropy DSm = - 18.931 J/(kg*K) for an annealed sample of the GdNi2 alloy at the Curie point of 75 K in a magnetic field of 13.5 T.

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“…[1][2][3][4][5][6][7] At present, magnetocaloric effect (MCE) is mainly characterized by isothermal magnetic entropy change (ΔS M ) and by the adiabatic temperature change (ΔT ad ). A lot of work has been done to find magnetic materials with large MCE, such as Gd 5 Si 2 Ge 2 , [8] MnFe(P 1Àx As x ), [9] La(Fe 13Àx Si x ) [10] RM 2 [11][12][13][14] (R ¼ rare earth element and M ¼ transition metal element), and R 2 T 2 X [15] compounds. The RCo 2 series compounds belong to the family of magnetic materials and have always been the focus of research.…”

Section: Introductionmentioning

confidence: 99%

Regulation of Magnetic Phase Transition and Magnetocaloric Effect of DyCo_2−xCr_x Compounds

Chen

et al. 2021

Physica Status Solidi (b)

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The magnetic phase transition, magnetic and magnetocaloric effect of DyCo 2Àx Cr x (x ¼ 0.0-0.2) compounds have been studied. X-ray diffraction (XRD) data show that the main phases of DyCo 2Àx Cr x compounds are MgCu 2 -type cubic crystal structure, and the maximum atomic concentration of Cr in DyCo 2 is 5%. With the x changed from 0.0 to 0.2, both of the lattice parameter and cell volume increased, and the coercivity at 10 K increased from 890 to 2839 Oe. With the introduction of Cr atoms, the type of magnetic phase transition can be regulated from the first order to the second order. Under a 5 T magnetic field, the maximum magnetic entropy changes (ΔS M ) of DyCo 2Àx Cr x (x ¼ 0.0, 0.1, and 0.2) compounds are 10.4, 8.4, and 6.8 J kg À1 K À1 , respectively, but the relative cooling power (RCP) actually increases, with values of 290.6, 312.5, and 396.7 J kg À1 respectively, which is because the width at half-maximum of the ΔS M peak (δT FWHM ) is increased.

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Magnetocaloric effect in Laves-phase rare-earth compounds with the second-order magnetic phase transition: Estimation of the high-field properties

Cited by 48 publications

References 41 publications

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

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

Гомогенизационный отжиг и магнитные свойства образца фазы Лавеса GdNi-=SUB=-2-=/SUB=-

Regulation of Magnetic Phase Transition and Magnetocaloric Effect of DyCo_2−xCr_x Compounds

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Magnetocaloric effect in Laves-phase rare-earth compounds with the second-order magnetic phase transition: Estimation of the high-field properties

Cited by 48 publications

References 41 publications

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

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

Гомогенизационный отжиг и магнитные свойства образца фазы Лавеса GdNi-=SUB=-2-=/SUB=-

Regulation of Magnetic Phase Transition and Magnetocaloric Effect of DyCo2−xCrx Compounds

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Regulation of Magnetic Phase Transition and Magnetocaloric Effect of DyCo_2−xCr_x Compounds