Enhanced low-field magnetocaloric effect in Dy-doped hexagonal GdBO3 compounds

Borates have attained increasing attention attributed to their excellent thermal stability, distinctive thermodynamic property, and high mechanical strength in recent years. A series of polycrystalline Dy-doped GdBO3 compounds was prepared, their crystal structures, magnetic properties, and cryogeni...

Full description

Saved in:
Bibliographic Details
Published in:Journal of rare earths 2023-11, Vol.41 (11), p.1728-1735
Main Authors: Xie, Huicai, Tian, Lu, Zhang, Lei, Wang, Junfeng, Sun, Hao, Gao, Xinqiang, Li, Zhenxing, Mo, Zhaojun, Shen, Jun
Format: Article
Language:English
Subjects:
Cryogenic magnetic refrigeration
Hexagonal GdBO3
Magnetic entropy change
Magnetocaloric effect
Rare earths
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Borates have attained increasing attention attributed to their excellent thermal stability, distinctive thermodynamic property, and high mechanical strength in recent years. A series of polycrystalline Dy-doped GdBO3 compounds was prepared, their crystal structures, magnetic properties, and cryogenic magnetocaloric effects were comprehensively investigated. The compounds crystallize in hexagonal structure (space group P63/mmc), the lattice constant decreases with the increase of Dy content. Dy-doping in GdBO3 significantly reduces critical magnetic field and enhances low-field magnetocaloric effect. The maximum magnetic entropy changes for the Gd1–xDyxBO3 (x = 0.6, 0.8, and 1) compounds in a field change of 2 T surpass 17.3 J/(kg·K) at 2.5 K, enhanced by nearly 120% compared to GdBO3 (8.0 J/(kg·K)). Besides, the corresponding refrigeration capacity increases from 33.9 to 62.2, 57.2, and 72.5 J/kg, respectively, with an enhancement of 70%–110%. The considerable maximum magnetic entropy change, refrigerating capacity, and temperature averaged entropy change make them competitive candidates for cryogenic magnetic refrigeration. A series of hexagonal Gd1–xDyxBO3 compounds undergoes second-order phase transitions below 2 K, being potential cryogenic magnetic refrigerants. The maximum magnetic entropy changes for Gd1–xDyxBO3 (x = 0.6, 0.8, and 1) with ΔH = 2 T surpass 17.3 J/(kg·K), enhanced by ∼120% compared to GdBO3, the refrigeration capacities are enhanced by 70%–110% attributed to the Dy doping. [Display omitted] •Hexagonal Gd1-xDyxBO3 (x = 0, 0.2, 0.4, 0.6, 0.8, and 1) compounds are synthesized.•They are second-order phase transition materials with ordering temperatures
ISSN:1002-0721
DOI:10.1016/j.jre.2022.08.008