Optimizing the Curie temperature of pseudo-binary RxR'2-xFe17 (R,R' = rare earth) for magnetic refrigeration

6th Meeting of the Spanish Neutron Scattering Association

Álvarez-Alonso, Pablo^1 ; Gorria, Pedro^2 ; Cuello, Gabriel^3 ; Orench, Inés Puente^3,4 ; Llamazares, José L. Sánchez^5 ; Franco, Victorino^6 ; Reiffers, Marian^7 ; Blanco, Jesús A.^8

Departamento de Electricidad y Electrónica, UPV/EHU, B Sarriena, s/n, Leioa

48940, Spain^1

Departamento de Física, EPI, Universidad de Oviedo, Gijón

33203, Spain^2

Institute Laue Langevin, 6 rue Jules Horowitz, Grenoble

38042, France^3

Instituto de Ciencia de Materiales de Aragón, CSIC-University Zaragoza, Zaragoza

50009, Spain^4

División de Materiales Avanzados, IPCyT, San-Luis-Potosí

78216, Mexico^5

Departamento de Física de la Materia Condensada, ICMSE-CSIC, Universidad de Sevilla, PO Box 1065, Sevilla

41080, Spain^6

Faculty of Humanities and Natural Sciences, Presov University, ul. 17. novembra 1, Presov

SK- 08116, Slovakia^7

Departamento de Física, Universidad de Oviedo, Calvo Sotelo, s/n, Oviedo

33007, Spain^8

关键词: Caloric effects;    Isothermal magnetic entropy change;    Master curve;    Moderate value;    Pseudo-binaries;    Refrigerant capacity;    Sub-lattices;    Temperature range;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/549/1/012019/pdf
DOI  :  10.1088/1742-6596/549/1/012019

来源: IOP

【 摘 要 】

Several pseudo-binary RxR'2-xFe17alloys (with R Y, Ce, Pr, Gd and Dy) were synthesized with rhombohedral Th2Zn17-type crystal structure determined from x-ray and neutron powder diffraction. The choice of compositions was done with the aim of tuning the Curie temperature (TC) in the 270 ± 20 K temperature range, in order to obtain the maximum magneto-caloric effect around room temperature. The investigated compounds exhibit broad isothermal magnetic entropy changes, ΔSM(T), with moderate values of the refrigerant capacity, even though the values of ΔSMPeakare relatively low compared with those of the R2Fe17compounds with R Pr or Nd. The reduction on the ΔSMPeakis explained in terms of the diminution in the saturation magnetization value. Furthermore, the ΔSM(T) curves exhibit a similar caret-like behavior, suggesting that the magneto-caloric effect is mainly governed by the Fe-sublattice. A single master curve for ΔSM/ΔSMPeak(T) under different values of the magnetic field change are obtained for each compound by rescaling of the temperature axis.