Cryogenic magnetocaloric effect in zircon-type RVO4 (R = Gd, Ho, Er, and Yb)

Dey, Koushik and Indra, Ankita and Majumdar, Subham and Giri, Saurav (2017) Cryogenic magnetocaloric effect in zircon-type RVO4 (R = Gd, Ho, Er, and Yb). In: Journal of Materials Chemistry C, 5 (7). pp. 1646-1650. ISSN 2050-7526

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Abstract

Low-temperature magnetic refrigeration has attracted the attention of the cryogenics research community in the areas of technology in space science and in the liquefaction of hydrogen or other fuel gases, although it has been less researched compared to room-temperature magnetic refrigeration. Here, we report that the RVO4 (R = Gd, Ho, Er, and Yb) series is promising for low-temperature cryogenic refrigeration. GdVO4 is the most promising material, exhibiting a maximum magnetocaloric effect (ΔSMmax) of 41.1 J kg−1 K−1 at 3 K for a change in field (ΔH) of 50 kOe. The values of ΔSMmax are also promising, with 7.94 J kg−1 K−1 at 15 K, 19.7 J kg−1 K−1 at 2 K, and 17.4 J kg−1 K−1 at 2 K with ΔH = 50 kOe for HoVO4, ErVO4, and YbVO4, respectively. The maximum value of adiabatic temperature change (ΔTadmax) attributed to the large magnetocaloric effect is 18 K for GdVO4 with ΔH = 50 kOe. The results further indicate that demagnetization with 50 kOe field close to the liquid hydrogen temperature at 20.3 K leads to the remarkable decrease of temperature to 3.5 K. Satisfying its potential as a refrigerant material, the thermal hysteresis of magnetization is negligible, and the values of ΔSMmax and ΔTadmax are as high as 12.4 J kg−1 K−1 and 8.5 K for 20 kOe change in field, which can be achieved without a superconducting magnet.

Item Type:	Journal Article
Publication:	Journal of Materials Chemistry C
Publisher:	Royal Society of Chemistry
Additional Information:	The Copyright of this article belongs to the Royal Society of Chemistry
Keywords:	Cryogenics; Demagnetization; Erbium; Liquefied gases; Magnetic refrigeration; Magnetocaloric effects; Refrigeration; Silicate minerals; Superconducting magnets; Temperature; Ytterbium; Adiabatic temperature change; Cryogenic refrigeration; Liquid hydrogen temperature; Low temperatures; Research communities; Room temperature magnetic refrigeration; Space science; Thermal hysteresis; Liquefaction of gases
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	07 Jun 2022 05:22
Last Modified:	07 Jun 2022 05:22
URI:	https://eprints.iisc.ac.in/id/eprint/72974

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