Structural and magnetocaloric properties in the aeschynite type GdCrWO6 and ErCrWO6 oxides. Issue 20 (15th October 2021)

• Record Type: Journal Article
• Authors: Tian, Yun; Ouyang, Jianlong; Xiao, Haibo; Zhang, Yikun
• Is Part Of: Ceramics international. Volume 47:Issue 20(2021)
• Page Start: 29197
• Page End: 29204
• Publication Date: 2021-10-15
• Subjects: Magnetocaloric effect (MCE) -- Rare earth -- Magnetic properties -- RECrWO6 oxides; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.07.084
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The crystal structure, microstructure, magnetic phase transitions and magnetocaloric effect (MCE) in KNaSnF6-type GdCrWO6 and ErCrWO6 oxides have been investigated. Both GdCrWO6 and ErCrWO6 oxides are confirmed to crystalize in a polar aeschynite type structure with the space group of Pna 21 (No.33, oP36). The grain size remains relatively average according to the SEM graph. Under low magnetic field of 0.1 T, the ErCrWO6 oxide undergoes two successive magnetic transitions around 22 and 7 K, whereas only a weak magnetic transition around 6 K can be noticed. The paramagnetic Curie temperatures θ p are fitted to be −17.0 and −16.6 K for GdCrWO6 and ErCrWO6 oxides, respectively, suggesting that the antiferromagnetic (AFM) interaction is dominant at ground state. With the magnetic field change (ΔH) of 0–7 T, the peak value of magnetic entropy change (-ΔSM ), refrigeration capacity (RC), relative cooling power (RCP) and 5 K lift temperature-averaged ΔSM (TEC) are figured to be 9.13 J/kg-K, 152 J/kg, 190 J/kg and 9.07 J/kg-K for GdCrWO6 as well as to be 5.3 J/kg-K, 128 J/kg, 161 J/kg and 5.09 J/kg-K for ErCrWO6, respectively. The MCE parameters for GdCrWO6 and ErCrWO6 oxides are comparable with recently reported RE -based MCE oxides, indicating present GdCrWO6 and ErCrWO6 oxides also considerable for cryogenic magnetic refrigeration (MR).