Journal ArticleDOI
Evaluation of the magnetocaloric effect from magnetization and heat capacity data
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TLDR
In this article, a procedure to evaluate the magnetocaloric effect (MCE) from magnetization and zero-field heat capacity data is described, and the MCE of gadolinium (Gd) obtained by this procedure is presented.Abstract:
Magnetic refrigeration is based on the magnetocaloric effect (MCE) – the ability of some materials to heat up when magnetized and cool down when removed from the magnetic field. The available techniques for studying the MCE are: (i) direct measurements by monitoring the change in material's temperature during the application or removal of the magnetic field; and (ii) indirect calculations from experimental data of magnetization and/or heat capacity as functions of temperature and magnetic field. In this paper the procedure to evaluate the MCE from magnetization and zero-field heat capacity data is described. The MCE – isothermal magnetic entropy change (ΔSM) and adiabatic temperature change (ΔTad) – of gadolinium (Gd) obtained by this procedure is presented. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)read more
Citations
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Direct and indirect measurement of the magnetocaloric effect in La0.67Ca0.33−xSrxMnO3 ± δ ()
TL;DR: The magnetocaloric properties of a series of manganites with the composition La0.67Ca0.33−xSrxMnO3 ± δ, have been investigated by direct and indirect measuring techniques as discussed by the authors.
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Magnetic entropy change in polycrystalline La1−xKxMnO3 perovskites
TL;DR: In this article, the Curie temperature (T C ) of the prepared samples is found to be strongly dependent on K content and spans between 260 and 309 K. The maximum magnetic entropy change observed for samples with different concentration of K, exhibits a linear dependence with the applied magnetic field.
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Structural, magnetic and magnetocaloric properties of La0.8Ba0.2Mn1−xFexO3 compounds with 0 ⩽ x ⩽ 0.1
TL;DR: In this article, the effect of Fe doping on the structural, magnetic and magnetocaloric proprieties in the La0.8Ba0.2Mn1−xFexO3 (0,⩽ ǫxǫµ) perovskites was reported.
Journal ArticleDOI
Magnetocaloric effect in potassium doped lanthanum manganite perovskites prepared by a pyrophoric method.
TL;DR: Controlling the temperature dependence of the magnetic entropy change (ΔS(M) measured under various magnetic fields is explained fairly well using the Landau theory of phase transitions.
Journal ArticleDOI
Structural and magnetocaloric properties of La1−yNayMnO3 compounds prepared by microwave processing
TL;DR: In this article, a detailed structural analysis has been performed on the prepared samples using the Rietveld FULLPROF program and important structural parameters are estimated, including the Curie temperature TC of the prepared pellets is strongly dependent on the sodium content in the compound and ranges between 196 and 312 K.
References
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Journal ArticleDOI
Magnetic phase transitions and the magnetothermal properties of gadolinium
TL;DR: A study of four Gd samples of different purities using ac susceptibility, magnetization, heat capacity, and direct measurements of the magnetocaloric effect in quasistatic and pulse magnetic fields revealed that all techniques yield the same value of the zero-field Curie temperature of 294(1) K as mentioned in this paper.
Journal ArticleDOI
Magnetocaloric effect from indirect measurements: Magnetization and heat capacity
TL;DR: In this article, an approach to calculate the magnetocaloric effect from the combined heat capacity and magnetization data is proposed, based on the assumption that heat capacity is magnetic-field independent.
Journal ArticleDOI
Review on research of room temperature magnetic refrigeration
TL;DR: In this article, the concept of magnetocaloric effect is explained and the development of the magnetic material, magnetic refrigeration cycles, magnetic field and the regenerator of room temperature magnetic refrigerators is introduced.
Journal ArticleDOI
Some common misconceptions concerning magnetic refrigerant materials
TL;DR: In this article, the relationship between extensive and intensive properties quantifying the magnetocaloric effect, i.e., between the isothermal entropy change and the adiabatic temperature change, respectively, have been analyzed.