Structural, magnetic and magnetocaloric effect in double perovskite Ba2CrMo1−xWxO6

Magnetic refrigeration, an emerging new technology for cooling and gas liquefaction, needs magnetic materials with specific thermomagnetic behavior. Depending on the thermodynamic cycle selected, the isothermal magnetic entropy change or the adiabatic temperature change upon field application needs to be a preselected function of temperature. In double perovskite Ba2CrMo1−xWxO6 (x = 0, 0.2 and 0.5) prepared by the sol–gel method, the experimental results show the observation of a large magnetocaloric effect (MCE) near the Curie temperature TC which decreases with the increasing of the substitution of Mo by W. The maximum of the magnetic entropy change peaks at the magnetic ordering temperature TC, and a large magnetic entropy change (|ΔSM| ≈ 1.6 J kg−1 K−1) is obtained at 285 K in the sample Ba2CrMo0.5W0.5O6 under an applied magnetic field of 10 kOe.