Heat-capacity measurements on small samples: The hybrid method

Structural, magnetic and magnetocaloric properties of Mn 2-x Cr x Sb compounds have been studied. In these compounds a first order magnetic phase transition from the ferrimagnetic to the antiferromagnetic state occurs with decreasing temperature, giving rise to giant inverse magnetocaloric effects that can be tuned over a wide temperature interval through changes in substitution concentration. Entropy changes as high as 7.5 J/kgK have been observed, and a composition independent entropy change is obtained for several different concentrations/working temperatures, making these compounds suitable candidates for a composite working material.

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“…Calorimetry measurements were performed using the setup built and reported by Klaasse et al 19 as well as a commercial TA instruments Q2000 DSC.…”

Section: Experimental Methodsmentioning

confidence: 99%

Tuning the giant inverse magnetocaloric effect in Mn2−xCrxSb compounds

Caron

Miao

Klaasse

et al. 2013

Applied Physics Letters

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“…[10][11][12][13][14][15] Therefore, the need for novel thermal devices has been continuously pushing scientists to carefully analyze the thermal behavior of magnetic critical processes. During the last years the realization of several in-field calorimetric techniques [16][17][18][19][20][21][22][23][24][25][26][27][28][29] contributed both to a better understanding of the thermomagnetic behavior of the most promising compounds showing first order phase transitions and to encourage the development of new materials. 15,30 Thus, the study of the time and frequency dependence of the MCE constitutes the next step to be taken.…”

Section: Introductionmentioning

confidence: 99%

Direct magnetocaloric characterization and simulation of thermomagnetic cycles

Porcari

Buzzi²,

Cugini³

et al. 2013

Review of Scientific Instruments

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An experimental setup for the direct measurement of the magnetocaloric effect capable of simulating high frequency magnetothermal cycles on laboratory-scale samples is described. The study of the magnetocaloric properties of working materials under operative conditions is fundamental for the development of innovative devices. Frequency and time dependent characterization can provide essential information on intrinsic features such as magnetic field induced fatigue in materials undergoing first order magnetic phase transitions. A full characterization of the adiabatic temperature change performed for a sample of Gadolinium across its Curie transition shows the good agreement between our results and literature data and in-field differential scanning calorimetry. © 2013 AIP Publishing LLC. [http://dx

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“…The direct application of equilibrium relations such as the Maxwell relations to first order phase transitions with hysteresis may then create ambiguous results as discussed widely in the literature [121][122][123][124][125][126][127][128]. These problems can be avoided by using direct calorimetric methods [129][130][131][132][133][134][135][136].…”

Section: A Hysteresis and Entropy Productionmentioning

confidence: 99%

Basics of the magnetocaloric effect

Basso

2017

Preprint

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This chapter reviews the basic physics and thermodynamics that govern magnetocaloric materials. The thermodynamics of magnetic materials is discussed by introducing relevant free energy terms together with their microscopic origin leading to a discussion of the sources of entropy that can change in an applied magnetic field. Such entropies account for measurable magnetocaloric effects, especially in the vicinity of magnetic phase transitions. Particular attention is devoted to first order magnetic transitions that involve the coupling of spin, lattice, electronic and anisotropic magneto-crystalline degrees of freedom. The problem of irreversibility and hysteresis, present in magnetocaloric materials with first order phase transitions is discussed in the context of out-ofequilibrium thermodynamics and hysteresis modeling.

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Heat-capacity measurements on small samples: The hybrid method

Cited by 10 publications

References 9 publications

Tuning the giant inverse magnetocaloric effect in Mn2−xCrxSb compounds

Tuning the giant inverse magnetocaloric effect in Mn2−xCrxSb compounds

Direct magnetocaloric characterization and simulation of thermomagnetic cycles

Basics of the magnetocaloric effect

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