Analysis of the Magnetocaloric Effect in Heusler Alloys: Study of Ni50CoMn36Sn13 by Calorimetric Techniques

Palacios, E.; Bartolomé, J.; Wang, Gaofeng; Burriel, R.; Skokov, Konstantin P.; Taskaev, S.; Khovaylo, Vladimir

doi:10.3390/e17031236

Cited by 13 publications

(6 citation statements)

References 23 publications

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“…Despite the improvement by Co addition, the very large Δ S iso value of this sample (23.7 J kg −1 K −1 ) is not transferred into a comparably large temperature change. The influence of the heat capacity, which links Δ S iso to Δ T ad , is similar for the investigated Heusler compounds and should not cause this large difference . The main reason is supposed to be the lack in the field dependence of the transition temperature for Ni‐Mn‐Sn(‐Co), which impedes a completely induced phase transition in fields of below 2 T, despite the sharp increase of

\frac{d M}{d T}

.…”

Section: Resultsmentioning

confidence: 85%

A Comparative Study on the Magnetocaloric Properties of Ni‐Mn‐X(‐Co) Heusler Alloys

Taubel

Gottschall

Fries

et al. 2017

Physica Status Solidi (b)

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We present a comprehensive study on three selected Heusler alloy systems. Ni-Mn-X(-Co) systems with X ¼ Al, In, Sn are compared with respect to the relevant magnetocaloric properties of their magnetostructural phase transition, namely martensitic transition temperature as well as its field dependence, magnetization change, and width of the thermal hysteresis. The latter one is strongly determining the reversibility of the magnetocaloric effect. Therefore the understanding of how to tailor it by extrinsic and intrinsic factors is of great importance. Our study of the magnetocaloric properties leads to the conclusion that the width of thermal hysteresis can be correlated to the magnetization change of the phase transition. Consequently, the adiabatic temperature change under cycling can largely vary despite similar values of isothermal entropy change for Ni-Mn-In-Co and Ni-Mn-Sn-Co. This result therefore shows the importance of tailoring sharpness, thermal hysteresis, and field dependence of the phase transition to achieve high values for the isothermal entropy change as well as a large magnetocaloric cooling effect in the different Heusler alloys.

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\frac{d M}{d T}

.…”

Section: Resultsmentioning

confidence: 85%

A Comparative Study on the Magnetocaloric Properties of Ni‐Mn‐X(‐Co) Heusler Alloys

Taubel

Gottschall

Fries

et al. 2017

Physica Status Solidi (b)

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“…In other compounds, such as Heusler alloys, the transition is not so sharp and the spurious contribution does not have the spike shape. This case was extensively discussed for Ni 50 CoMn 36 Sn 13 [20]. This alloy has inverse magnetocaloric effect in the temperature range of the martensitic transition, S T > 0 for B > 0, since the high temperature phase (austenite) is ferromagnetic while the low temperature one (martensite) is paramagnetic.…”

Section: The Family (Mnnisi) 1−x (Fenige) Xmentioning

confidence: 99%

Calorimetric study of the giant magnetocaloric effect in (MnNiSi)0.56(FeNiGe)0.44

2021

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MnNiSi) 0.56 (FeNiGe) 0.44 belongs to a new family of alloys, similar to MnAs, showing a magnetostructural first-order transition near room temperature with large latent heat and magnetocaloric effect (MCE). From isothermal magnetization, remarkable values of the entropy change have been reported, such as | S T | = 11.5 J/kg K at 290 K for the small field change of 1 T, or | S T | = 70.1 J/kg K for 5 T on a slightly different composition. Strangely, this last value almost doubles that obtained from the Clausius-Clapeyron equation.Therefore, a very detailed set of calorimetric determinations have been made including heat capacity by adiabatic and differential scanning calorimetry (DSC), and direct measurement of the heat absorbed on isothermal demagnetization for several magnetothermal histories of the sample. We found high values of | S T | = 45.7 J/kg K at 289.4 K for a field change of 7 T, for a sample previously cooled to a low temperature and then heated under magnetic field to the target temperature. This value is high but very far from previously reported data, which happened to be nonphysical but obtained from a very frequently used, but incorrect, experimental protocol to determine S T from magnetization, via the Maxwell relation. The spurious contribution has been analyzed and computed, explaining the nonphysical reported values. The strong thermal and magnetic hysteresis of 8.4 K and 8.3 T, respectively, make this alloy useless for magnetic refrigeration, but the results encourage searching for other derivatives with lower hysteresis which could have even higher | S T |.

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“…with ∆M and ∆S being the jump produced at the transition for the magnetization and entropy, respectively. Dissipative terms are not considered, as we are looking for an approximate value that represents the general trend, although they should be added for a detailed analysis [39,40]. For the atomic magnetic moment dependence, ∆M increases with increasing m and, therefore, ∆S also increases.…”

Section: Resultsmentioning

confidence: 99%

Reversibility of the Magnetocaloric Effect in the Bean-Rodbell Model

Moreno-Ramírez

Franco

2021

Magnetochemistry

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The applicability of magnetocaloric materials is limited by irreversibility. In this work, we evaluate the reversible magnetocaloric response associated with magnetoelastic transitions in the framework of the Bean-Rodbell model. This model allows the description of both second- and first-order magnetoelastic transitions by the modification of the parameter ( for second-order and for first-order ones). The response is quantified via the Temperature-averaged Entropy Change (), which has been shown to be an easy and effective figure of merit for magnetocaloric materials. A strong magnetic field dependence of is found for first-order transitions, having a significant increase when the magnetic field is large enough to overcome the thermal hysteresis of the material observed at zero field. This field value, as well as the magnetic field evolution of the transition temperature, strongly depend on the atomic magnetic moment of the material. For a moderate magnetic field change of 2 T, first-order transitions with have better than those corresponding to stronger first-order transitions and even second-order ones.

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Analysis of the Magnetocaloric Effect in Heusler Alloys: Study of Ni50CoMn36Sn13 by Calorimetric Techniques

Cited by 13 publications

References 23 publications

A Comparative Study on the Magnetocaloric Properties of Ni‐Mn‐X(‐Co) Heusler Alloys

A Comparative Study on the Magnetocaloric Properties of Ni‐Mn‐X(‐Co) Heusler Alloys

Calorimetric study of the giant magnetocaloric effect in (MnNiSi)0.56(FeNiGe)0.44

Reversibility of the Magnetocaloric Effect in the Bean-Rodbell Model

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