Gd induced modifications in the magnetocaloric properties of dysprosium manganites

[摘要] We report structural, electronic, magnetic, and magnetocaloric studies of polycrystalline DyMnO3 and its A-site Gd substituents, Dy1-xGdxMnO3, where 0 <= x <= 1. Detailed comparison of various magnetocaloric parameters shows that Dy0.5Gd0.5MnO3 has the best values with a large isothermal magnetic entropy change. -Delta S-m(max) similar to 15.35 J/kg K, adiabatic temperature change, Delta T-ad(max) similar to 6.15 K and relative cooling power, RCP similar to 307 J/kg, suggesting that rare earth mixing plays a vital role in enhancing the magnetocaloric properties. In addition, absence of magnetic and thermal hysteresis also makes it one of the best candidates for magnetic refrigeration among all known potential candidates for cryogenic temperature applications. (C) 2021 Elsevier B.V. All rights reserved.

[发布日期] 2021-11-25

[关键词] Mixed rare-earth oxides;Magnetization;Heat capacity;Magnetic entropy;Adiabatic temperature;Magnetocaloric effect