Spin and elastic contributions to isothermal entropy change

Mukherjee, Tathagata; Skomski, Ralph; Michalski, Steven A.; Sellmyer, David J.; Binek, Christian

doi:10.1063/1.3676432

Cited by 5 publications

(4 citation statements)

References 15 publications

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“…This is, in general, the case, with the exception of first-order phase transitions, where the entropy change at the transition can be calculated with the help of the Clausius-Clapeyron equation. 9,15 Equation (1) misleadingly suggests that the use of an external magnetic field is mandatory in order to achieve a sizeable isothermal entropy change. It is one of the major objectives of this manuscript to offer evidence that applied magnetic fields are not necessary to utilize the MCE.…”

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confidence: 99%

Near-room-temperature refrigeration through voltage-controlled entropy change in multiferroics

Binek

Burobina

2013

Applied Physics Letters

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Composite materials with large magnetoelectric effect are proposed for application in advanced near-room-temperature refrigeration. The key innovation rests on utilizing the magnetocaloric effect in zero applied magnetic fields. This approach promises sizable isothermal entropy change and virtually temperature-independent refrigerant capacity through pure voltage-control. It is in sharp contrast with the conventional method of exploiting the magnetocaloric effect through applied magnetic fields. We outline the thermodynamics and estimate an isothermal entropy change specifically for the La0.7Sr0.3MnO3/Pb(Mg1/3Nb2/3)O3-PbTiO3(001) two-phase composite material. Finally, we propose structural variations of two-phase composites, which help in overcoming the challenging task of producing nanostructured material in macroscopic quantities.

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confidence: 99%

Near-room-temperature refrigeration through voltage-controlled entropy change in multiferroics

Binek

Burobina

2013

Applied Physics Letters

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“…When only the magnetic degrees of freedom are considered, the maximum molar isothermal entropy change is determined by the spin multiplicity and is equal to Rln(2Jþ1), where J is the angular momentum of an individual atom. 45 It is well accepted that the crystal field scheme of the Er 3þ ion (with J ¼ 15/2) is expected to have eight well defined Kramers doublets. The estimated total entropy value S(T) at T N (about 5.14 J/mol K at 8.5 K) is almost close to the Rln2 indicating the ground state well separated in energy from other excited levels.…”

Section: Resultsmentioning

confidence: 99%

Magnetocaloric effect in the metamagnet ErRhSi compound

Debnath

Nair

Strydom

et al. 2016

Journal of Applied Physics

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The magnetocaloric effect is observed in the 1: 1: 1 compound ErRhSi, which is a metamagnet is reported in this paper. ErRhSi crystallizes in the orthorhombic space group Pnma, adopting the TiNiSi structure type, with lattice parameters a(angstrom) = 6.7903(5), b(angstrom) = 4.1881(3), and c(angstrom) = 7.3847(4). Our magnetic measurements confirm an antiferromagnetic phase transition at T-N approximate to 8.5 K, also supported by the specific heat measurement. Crystal field effects of Er3+ are suggested by the inverse magnetic susceptibility data which do not conform to an ideal Curie-Weiss behaviour and also by the total entropy that attains Rln (2) at T-N. Although the magnetic hysteresis indicates ErRhSi to be a soft magnet, several clear metamagnetic features are observed at 2K. Magnetic entropy change Delta S-M = -8.7 J/kg-K is observed at about 9K with the application of 5 T magnetic field. The corresponding adiabatic temperature change Delta T-ad is about 4K. Large magnetocaloric effects suggest that this material is suitable for the low temperature magnetic refrigeration. Published by AIP Publishing

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“…When the external force is removed, the molecular chain spontaneously tends to the state of entropy increase due to thermal motion, and the molecular chain restores to the curl state by extension. The strain energy stored in the material decreases with the temperature under the same strain condition [ 39 , 40 ]. This is due to the loss of energy caused by the increasing relaxation of the molecules because of the degradation of the colloid when the temperature rises.…”

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confidence: 99%

Strain energy-based rubber fatigue life prediction under the influence of temperature

et al. 2018

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Aiming at the problem of the fatigue life prediction of rubber under the influence of temperature, the effects of thermal ageing and fatigue damage on the fatigue life of rubber under the influence of temperature are analysed and a fatigue life prediction model is established by selecting strain energy as a fatigue damage parameter based on the uniaxial tensile data of dumbbell rubber specimens at different temperatures. Firstly, the strain energy of rubber specimens at different temperatures is obtained by the Yeoh model, and the relationship between it and rubber fatigue life at different temperatures is fitted by the least-square method. Secondly, the function formula of temperature and model parameters is obtained by the least-square polynomial fitting. Finally, another group of rubber specimens is tested at different temperatures and the fatigue characteristics are predicted by using the proposed prediction model under the influence of temperature, and the results are compared with the measured results. The results show that the predicted value of the model is consistent with the measured value and the average relative error is less than 22.26%, which indicates that the model can predict the fatigue life of this kind of rubber specimen at different temperatures. What's more, the model proposed in this study has a high practical value in engineering practice of rubber fatigue life prediction at different temperatures.

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Spin and elastic contributions to isothermal entropy change

Cited by 5 publications

References 15 publications

Near-room-temperature refrigeration through voltage-controlled entropy change in multiferroics

Near-room-temperature refrigeration through voltage-controlled entropy change in multiferroics

Magnetocaloric effect in the metamagnet ErRhSi compound

Strain energy-based rubber fatigue life prediction under the influence of temperature

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