Structural, magnetic and magnetocaloric properties of TMCeFeO4 (TM= Mn , Co) spinel ferrites powders

Abstract In this paper, a successfully synthesized TMCeFeO4 (TM = Mn, Co) by the sol–gel technique has been studied in detail. The structural, magnetic and magnetocaloric properties are performed using an X-ray powder diffractometer and a vibrating sample magnetometer (VSM). X-ray diffraction (XRD) analysis shows that both samples belong to the F d - 3 m space group of the cubic spinel crystal system. Moreover, the calculated lattice parameters of MnCeFeO4 and CoCeFeO4 samples are found to be 8.409 A and 8.397 A , respectively. On the other hand, temperature and field dependent magnetization curves demonstrate that both samples exhibit a second-order ferromagnetic (FM)-paramagnetic (PM) phase transition at T C = 640 K and 630 K for MnCeFeO4 and CoCeFeO4, respectively. The maximum of magnetic entropy change - Δ S M m a x , calculated from Maxwell relation at an applied magnetic field change of μ 0 Δ H = 5 T , are found to be 0.404 and 0.463 J K g - 1 K - 1 corresponding to relative cooling powers (RCPs) about 41.62 and 41.53 J K g - 1 for MnCeFeO4 and CoCeFeO4, respectively.