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Structure and cryogenic magnetocaloric effects of NaREO2 (RE = Er, Ho) compounds.
- Source :
-
Ceramics International . Apr2024:Part A, Vol. 50 Issue 7, p10385-10391. 7p. - Publication Year :
- 2024
-
Abstract
- Rare-earth (RE) based oxides have presented great application prospects in low-temperature magnetic refrigeration technology. Thus far, studies on magnetic and especially magnetocaloric properties of alkali-metal RE oxides are limited, largely due to the difficulty in synthesizing these oxides. In this work, Na RE O 2 (RE = Er, Ho) compounds with both the rhombohedral (R 3 ‾ m space group) and cubic (Fm 3 ‾ m space group) structures were prepared by a facile ball-milling-aided sintering approach. The cubic structural compounds exhibit a spherical microstructure composed of vertically-grown irregular hexahedra, which sharply contrast with a loose lamellar microstructure of the rhombohedral structural compound. The as-prepared NaHoO 2 or NaErO 2 compound exhibits an antiferromagnetic ordering of RE 3+ moments at a temperature of 2.4 K or lower than 2 K respectively. An excellent comprehensive magnetic refrigeration performance at cryogenic temperatures in a low magnetic field change of 0–20 kOe was obtained in these compounds, including a complete reversibility of the magnetocaloric effect, a maximal magnetic-entropy change Δ S M at 2 K of 12 J/kg·K for the rhombohedral NaErO 2 and a relative cooling power (RCP) of 79.7 J/kg for the cubic NaHoO 2. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 50
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 175643899
- Full Text :
- https://doi.org/10.1016/j.ceramint.2023.12.350