Article
First- and second-order phase transitions in RE6Co2Ga (RE = Ho, Dy or Gd) cryogenic magnetocaloric materials
Alternative title | RE6Co2Ga (RE = Ho, Dy or Gd) 低温磁制冷材料的一级相变和二级相变 |
Author/s | Guo, Dan
Moreno Ramírez, Luis Miguel Romero-Muñiz, Carlos Zhang, Yikun Law, Jia Yan Franco García, Victorino Wang, Jiang Ren, Zhongming |
Department | Universidad de Sevilla. Departamento de Física de la Materia Condensada |
Publication Date | 2021 |
Deposit Date | 2021-11-25 |
Published in |
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Abstract | Rare-earth (RE) rich intermetallics crystallizing in orthorhombic Ho6Co2Ga-type crystal structure exhibit peculiar magnetic properties that are not widely reported for their magnetic ordering, order of magnetic phase ... Rare-earth (RE) rich intermetallics crystallizing in orthorhombic Ho6Co2Ga-type crystal structure exhibit peculiar magnetic properties that are not widely reported for their magnetic ordering, order of magnetic phase transition, and related magnetocaloric behavior. By tuning the type of RE element in RE6Co2Ga (RE = Ho, Dy or Gd) compounds, metamagnetic anti-to-paramagnetic (AF to PM) phase transitions could be tuned to ferro-to-paramagnetic (FM to PM) phase transitions. Furthermore, the FM ground state for Gd6Co2Ga is confirmed by density functional theory calculations in addition to experimental observations. The field dependence magnetocaloric and Banerjee’s criteria demonstrate that Ho6Co2Ga and Dy6Co2Ga undergo a first-order phase transition in addition to a second-order phase transition, whereas only the latter is observed for Gd6Co2Ga. The two extreme alloys of the series, Ho6Co2Ga and Gd6Co2Ga, show maximum isothermal entropy change (∣ΔSisomax(5 T)∣) of 10.1 and 9.1 J kg−1K−1 at 26 and 75 K, close to H2 and N2 liquefaction, respectively. This outstanding magnetocaloric effect performance makes the RE6Co2Ga series of potential for cryogenic magnetic refrigeration applications. |
Funding agencies | Agencia Estatal de Investigación. España PID2019-105720RB-I00 |
Project ID. | 52071197
19ZR1418300 19DZ2270200 PID2019-105720RB-I00 US-1260179 P18-RT-746 202006890050 |
Citation | Guo, D., Moreno Ramírez, L.M., Romero-Muñiz, C., Zhang, Y., Law, J.Y., Franco García, V.,...,Ren, Z. (2021). First- and second-order phase transitions in RE6Co2Ga (RE = Ho, Dy or Gd) cryogenic magnetocaloric materials. Science China Materials, 64 (11), 2846-2857. https://doi.org/10.1007/s40843-021-1711-5. |
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