Simulation of the magnetic and magnetocaloric properties of hydrides of the La(Fe0.88Si0.12)13 compound by applying a negative pressure

Based on the model calculation, it has been shown that the effect of hydration of the ferromagnetic compounds La(Fe_0.88Si_0.12)₁₃H _y is quantitatively adequately described by the introduction of a negative pressure. The calculations have been performed for compounds with hydrogen concentrations y = 0, 0.5, 1.0, and 1.5. It has been found that these concentrations correspond to the pressures P = 0, ?0.95, ?1.85, and ?2.80 GPa, respectively. The calculated Curie temperature, magnetization, characteristics of the magnetocaloric effect, and other properties are in satisfactory agreement with experiment.