Magnetocaloric Properties of Mn(1.1)Fe(0.9)P(0.5)As(0.5−x)Ge(x) (0 ≤ x ≤ 0.1) Compounds

Intermetallic compounds with the overall formula Mn(1.1)Fe(0.9)P(0.5)As(0.5−x)Ge(x) (x varies from 0 to 0.1) were investigated in order to study their magnetocaloric effect by monitoring the adiabatic temperature change, magnetic entropy change and their relation to structural parameters. It was found that the maximum of magnetocaloric effect was achieved for x = 0.02. Adiabatic temperature change for consolidated powder was equal to 2.75 K for the magnetic field change ΔB = 1.7 T for the sample with x = 0.02. For the pure non-doped sample, this parameter is much lower: ΔT(ad) = 1.7 K @ ΔB = 1.7 T. This result was correlated with the change of structural parameters such as lattice constants and the unit cell volume.