摘要
The lattice parameter and magnetocaloric properties of three samples of LaFe11.2Co0.7Si1.1-xGax with x = 0, 0.03 and 0.05 have been investigated by X-ray powder diffraction and magnetization measurements. The lattice parameter increases slightly and the Curie temperature increases somewhat with increasing gallium content. However, a small amount of Ga doping into the sample decreases the magnetic entropy change of the sample. All the samples remain in the first-order magnetic phase transition. The most striking effect of the Ga doping is that the cooling capacity in the samples increases significantly. The maximum magnetic entropy change, ASM and the cooling capacity of the sample LaFe11.2Co0.7Si1.07Ga0.03 are 11.9 J·kg^-1·K^-1 and 254.8 J·kg^-1, respectively.
The lattice parameter and magnetocaloric properties of three samples of LaFe11.2Co0.7Si1.1-xGax with x = 0, 0.03 and 0.05 have been investigated by X-ray powder diffraction and magnetization measurements. The lattice parameter increases slightly and the Curie temperature increases somewhat with increasing gallium content. However, a small amount of Ga doping into the sample decreases the magnetic entropy change of the sample. All the samples remain in the first-order magnetic phase transition. The most striking effect of the Ga doping is that the cooling capacity in the samples increases significantly. The maximum magnetic entropy change, ASM and the cooling capacity of the sample LaFe11.2Co0.7Si1.07Ga0.03 are 11.9 J·kg^-1·K^-1 and 254.8 J·kg^-1, respectively.
基金
the Opening Foun-dation of Guangxi Key Laboratory for the Advance Materi-als and New Preparation Technology
