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Polycrystalline perovskite AMn 1−x TiO 3 with A = La 0.5 Pr 0.2 Sr 0.3 (x = 0.0 and 0.1) have been prepared using solid-state reaction method. X-ray powder diffraction and Rietveld refinement revealed that all samples crystallize in a rhombohedral structure with space group R3c From M-T curve, we determined the Curie temperature, where the magnetization value decreases abruptly. The Curie temperature (T C ) decreases from 280 to 123 K when the percentage of Ti increases to 10%. The values of the magnetization M(H ) decrease when increasing the Ti content. Moreover, the magnetocaloric effect (MCE) was estimated in terms of isothermal entropy change (− S M ) using the M(T, μ 0 H ) data and employing the thermodynamic Maxwell equation. In addition, using a phenomenological model, we determine magnetocaloric effect from the calculation of magnetization as a function of temperature under different external magnetic fields. Also, we can determine the relative cooling power (RCP) and the specific heat which varies from 2.803 to 7.354 J/(kg/K) for the undoped sample from M(T , μ 0 H ) data at different magnetic fields theoretically.

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