Abstract
Polycrystalline perovskite AMn1−xTiO3 with A = La0.5Pr0.2Sr0.3 (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 Rbar {3}c From M–T curve, we determined the Curie temperature, where the magnetization value decreases abruptly. The Curie temperature (TC) 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 (−ΔSM) using the M(T, μ0H) 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, μ0H) data at different magnetic fields theoretically.
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