Magnetic entropy change and magnetic properties of LaFe_11.5Si_1.5 after controlling the Curie temperature by partial substitution of Mn and hydrogenation

Magnetic properties and magnetic entropy changes of La(Fe_1-xMn_x)_11.5Si_1.5H_y compounds are investigated. Their Curie temperatures are adjusted to room temperature by partial Mn substitution for Fe and hydrogen absorption in 1-atm (1 atm=1.01325×10⁵ Pa) hydrogen gas. Under a field change from 0 T to 2 T, the maximum magnetic entropy change for La(Fe_0.99Mn_0.01)_11.5Si_1.5H_1.61 is -11.5 J/kg. The suitable Curie temperature and large value of Δ S_m make it an attractive potential candidate for the room temperature magnetic refrigeration application.