Abstract
In this paper, magnetic and magnetocaloric properties of RCrO4 (R=Gd and Er) oxides have been investigated. It is found that GdCrO4 and ErCrO4 exhibit a second-order magnetic transition from ferromagnetic to paramagnetic states at their Curie temperatures of 22.0K and 14.9K, respectively. The maximal magnetic entropy change (ΔSM) for a field variation of 0–5T have reached 22.8Jkg−1K−1 for GdCrO4 and 20.5Jkg−1K−1 for ErCrO4. The collective magnetic contributions from R3+ and Cr5+ ions lead to the large ΔSM. For the same field variation, table-like ΔSM of ~19.5Jkg−1K−1 and a large refrigerant capacity (RC) of 117Jkg−1 have been achieved for the composite material formed by GdCrO4 and ErCrO4 with the mass ratio of 1:1 from 16.0K to 22.0K. Since the liquid hydrogen temperature (20.3K) locates within this range, large reversible magnetocaloric effect, high RC as well as the low cost make GdCrO4–ErCrO4 composite material a potential candidate for magnetic refrigerant for the storage of liquid hydrogen.
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