Heat flow measurements and the order of the magnetic transition in (Dy,Gd)Co2 solid solutions

Sousa, V.S.R. de; Monteiro, J.C.B.; Reis, R. D. dos; Medina, A. N.; Gama, S.; Ranke, P.J. von; Gandra, F. C. G.

doi:10.1016/j.jallcom.2011.11.027

Cited by 8 publications

(2 citation statements)

References 25 publications

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“…Therefore, heat-flow methods emerge as an excellent alternative for the investigation of the MCE. In particular, those methods using small Peltier units to determine the heat flow have proven to be very effective [29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Direct and Indirect Determination of the Magnetocaloric Effect in the Heusler Compound Ni1.7Pt0.3MnGa

Reis

Caron

Singh

et al. 2021

Entropy

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Magnetic shape-memory materials are potential magnetic refrigerants, due the caloric properties of their magnetic-field-induced martensitic transformation. The first-order nature of the martensitic transition may be the origin of hysteresis effects that can hinder practical applications. Moreover, the presence of latent heat in these transitions requires direct methods to measure the entropy and to correctly analyze the magnetocaloric effect. Here, we investigated the magnetocaloric effect in the Heusler material Ni1.7Pt0.3MnGa by combining an indirect approach to determine the entropy change from isofield magnetization curves and direct heat-flow measurements using a Peltier calorimeter. Our results demonstrate that the magnetic entropy change ΔS in the vicinity of the first-order martensitic phase transition depends on the measuring method and is directly connected with the temperature and field history of the experimental processes.

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Section: Introductionmentioning

confidence: 99%

Direct and Indirect Determination of the Magnetocaloric Effect in the Heusler Compound Ni1.7Pt0.3MnGa

Reis

Caron

Singh

et al. 2021

Entropy

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“…The series RM 2 is one of the most investigated because of the simple cubic crystal field calculation involved. [2][3][4][5][6] On the other hand, the series R 3 M has attracted attention because it has the highest R/M ratio of the R x M y family and possibly a high MCE value. 7 Some of the R 3 M compounds with R ¼ Gd, Tb, Er, Y and M ¼ Ni, Co, Rh 8-11 had their physical properties determined.…”

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confidence: 99%

The physical properties of Gd3Ru: A real candidate for a practical cryogenic refrigerator

Monteiro

Reis

Gandra

2015

Applied Physics Letters

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The magnetization, the specific heat, and the magnetocaloric effect (MCE) for Gd3Ru are presented as function of temperature at different magnetic fields. The results show a maximum entropy change −ΔS= 30 J/kg K @ 5 T, which is the highest value for the R3M compounds. With a non-hysteretic transition of first order type at TC = 54 K, it presents a temperature change ΔTmax = 5.7 K around 59 K with a refrigerating cooling power of 700 J/kg and these results are comparable to values found for giant MCE materials. This compound is stable and able to operate at temperatures between 90 K and 40 K with a minimum −ΔS= 5 J/kg K. These figures were obtained by sweeping the magnetic field without using sample preparation routines. This methodology is appropriate to evaluate the MCE for the cycling process of a cryogenic magnetic refrigerator.

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Magnetic properties and magnetic entropy changes of MRE2Co7 compounds

Zhong

Liu

Min

et al. 2015

Sci. China Phys. Mech. Astron.

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Heat flow measurements and the order of the magnetic transition in (Dy,Gd)Co2 solid solutions

Cited by 8 publications

References 25 publications

Direct and Indirect Determination of the Magnetocaloric Effect in the Heusler Compound Ni1.7Pt0.3MnGa

Direct and Indirect Determination of the Magnetocaloric Effect in the Heusler Compound Ni1.7Pt0.3MnGa

The physical properties of Gd3Ru: A real candidate for a practical cryogenic refrigerator

Magnetic properties and magnetic entropy changes of MRE2Co7 compounds

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