resumo
In this study, a combination of induction melting and suction casting methods were used to produce a series of high-purity samples of La1-xRxFe11.6Si1.4 system with R = Pr and Nd for x = 0.1, 0.2, 0.3 and 0.4. The Curie temperature (T-C) is lowered for all the substituted compositions compared to LaFe11.6Si1.4, while the hysteresis area shows a small increase for higher amounts of substitution element. The estimated isothermal magnetic entropy change (Delta S-T) of all samples are in the same range with a maximum of 25 Jkg(-1)K(-1)Delta T-ad, under the cyclic conditions for all compositions decreases compared to the first application of the magnetic field due to the thermal hysteresis. Applying the Bean-Rodbell model to the isothermal magnetization data, the temperature dependence of the critical field was found. Excluding the phase transition region, the model accurately describes the temperature and field dependence of magnetization above and below the magnetic transition, highlighting the magnetic moment change of the system due to the structural transformation.
categoria
Physics, Applied
autores
Davarpanah, A; Radulov, I; Shayanfar, N; Maccari, F; Skokov, K; Amaral, J; Gutfleisch, O
nossos autores
Amin Davarpanah
Estudante de doutoramento
João Cunha de Sequeira Amaral
Investigador AuxiliarProjectos
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2019)
Projeto de Investigação Exploratória: João Amaral (IF/01089/2015)
agradecimentos
The work was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [Project-ID 405553726 TRR 270] and project CICECO-Aveiro Institute of Materials, FCT reference UID/CTM/50011/2019, financed by Portuguese national funds through the FCT/MCTES. The authors acknowledge the FCT-DAAD bilateral research project 'Magnetovolume and spin-hybridization optimized magnetic refrigerants'. J. S. Amaral acknowledges FCT IF/01089/2015 research Grant. A Davarpanah acknowledges FCT SFRH/BD/103556/2014 PhD Grant.