Enhanced Magnetocaloric Effect by the Rare Earth Polarization due to the Exchange with a Transition Metal - Study of GdCrO4

Elías Palacios; Corrado Tomasi; Regino Saez-Puche; Antonio Juan dos Santos-García; Francisco Fernandez-Martinez; Ramón Burriel

doi:10.4028/www.scientific.net/SSP.257.139

Paper Titles

Negative Magnetization in NdFe_xGa_1-xO₃ Studied by XMCD
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Structural Electronic and Optical Properties of MgO, CaO and SrO Binary Compounds: Comparison Study
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Transition Metal Based Magneto Caloric Materials for Energy Efficient Heat Pumps
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Tetrahedrites for Low Cost and Sustainable Thermoelectrics
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Enhanced Magnetocaloric Effect by the Rare Earth Polarization due to the Exchange with a Transition Metal - Study of GdCrO₄
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Magnetocaloric Properties of MnBi Compound as a Function of Grain Size
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Synthesis and Structural Characterization of Ca₁₄Nb_xIn_1-_xAs₁₁ (x ≈ 0.85)
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Thermal Instability of Holmium and Thulium Dodecaborides in Vacuum
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A Potential in Thermoelectric Oxide Phononic Crystal
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Enhanced Magnetocaloric Effect by the Rare Earth Polarization due to the Exchange with a Transition Metal - Study of GdCrO₄

Abstract:

The zircon polymorph of GdCrO₄ has a large magnetocaloric effect over a wide temperature range, with |ΔS_T| > 20 J/kg·K from 6 K to 34 K, for a magnetic field of 9 T. This unusual behaviour is very interesting on magnetic refrigeration applications, for liquefying H₂ or natural gas. The mean-field approach explains that it is due to the weaker Gd-Cr magnetic exchange relative to the Cr-Cr one, while the Gd-Gd exchange is negligible. This possibility has not been sufficiently studied and opens an interesting strategy to design more efficient materials for magnetic refrigeration.

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Periodical:

Solid State Phenomena (Volume 257)

Pages:

139-142

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.257.139

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Online since:

October 2016

Authors:

Elías Palacios*, Corrado Tomasi, Regino Saez-Puche, Antonio Juan dos Santos-García, Francisco Fernandez-Martinez, Ramón Burriel

Keywords:

Magnetic Refrigeration, Magnetocaloric Effect, Mean Field

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