Critical exponents and magnetocaloric effect of Ba1.95Ag0.05FeMoO6 double perovskite oxide

This research explores the magnetocaloric effect in the Ba 1.95 Ag 0.05 FeMoO 6 double perovskite sample, which was synthesized via the sol-gel method. The critical exponents and the magnetocaloric effect of the sample were analyzed through both experimental and theoretical methods. These were determined using an iterative approach based on the Kouvel-Fisher analysis, modified Arrott plots, and the Widom scaling law. The transition from paramagnetic to ferromagnetic phases takes place at approximately 320 K. When a magnetic field of 3 T is applied, the maximum magnetic entropy change (-ΔS M ) close to the Curie temperature (T C ) is about 0.690 J kg -1 K -1 , and the corresponding relative cooling power (RCP) at 3 T is approximately 48 J kg -1 . The magnetic entropy change was calculated using Landau theory and Maxwell's relation, demonstrating remarkable consistency.