Rapid formation of the magnetocaloric phase in La-Fe-Co-Si magnetocaloric alloys for near room temperature applications

作者：Huang, X.; Dong, X. T.; Zhong, X. C.^*; Yao, S. Y.; Huang, J. H.; Liu, C. L.; Liu, J.; Liu, Z. W.; Ramanujan, R. V.

来源：Intermetallics, 2023, 157: 107870.

DOI：10.1016/j.intermet.2023.107870

• La-Fe-Co-Si alloy
• Magnetocaloric effect
• Magnetic refrigeration
• Phase evolution

The effect of La content on the phase formation, microstructural evolution and magnetocaloric properties of off-stoichiometric LaxFe11Co0.8Si1.2 (x = 1.0, 1.2, 1.4, 1.6) alloys has been investigated. The time for forming a high content of the desired 1:13 phase decreased with an increase in La content, due to the presence of the 5:3 phase and fine alpha-Fe dendrites. However, excessive La content results in an undesirable La-rich phase. After annealing at 1323 K for 7 days, a high content of the 1:13 phase (>90 wt%), and large maximum magnetic entropy change (-Delta S-M)(max) of 6.81-7.59 J/kg center dot K (Delta H = 2 T) in the temperature range 270-278 K was obtained in all samples. Large values of (-Delta S-M)(max) and tunable Curie temperature (T-C) along with short annealing time make these alloys promising magnetic refrigeration materials for near room temperature applications.

• 单位
  南阳理工学院; 上海大学