Refrigerant capacity and magnetocaloric effect on LaFe_(11.1)Co_(0.8)Si_(1.1)B_x Alloys

摘要

In this paper, we report on the structure, magnetic properties and magnetocaloric effect in NaZn_(13)-type LaFe_(11.1)Co_(0.8)Si_(1.1)B_x alloys close to room temperature. The stable NaZn_(13) cubic structure phase (space group is Fm-3c) can easily obtained by annealing at 1080°C for 225 hours. The maximal values of magnetic entropy change for LaFe_(11.1)Co_(0.8)Si_(1.1)B_x (x=0.2, 0.25) were found to be 5.3 and 5.9 J/kg K at Curie temperature for a magnetic field change in 0-1.5T, respectively. The calculated refrigerant capacity for a field change in 0-1.5T is about 147 and 107 J/kg K, for LaFe_(11.1)Co_(0.8)Si_(1.1)B_(0.25) and LaFe_(11.1)Co_(0.8)Si_(1.1)B_(0.25) respectively, which is as larger as those of Gd(99.3%) alloy.