77. Study of the Magnetocaloric Effect in the New Compound La_0.67Sr_0.16Ca_0.17MnO₃: Application to Non-polluting Cooling

Magnetic cooling based on magnetocaloric effect is one of the most important candidate applications as solutions for enjoying a non-polluting environment. In this work, a study of the magnetocaloric effect (EMC) in La_0.67Sr_0.16Ca_0.17MnO₃ perovskite was made from an experimental measurement of magnetization as a function of temperature under low magnetic field and using phenomenological model. The results show 0.21 J/Kg K is the value of maximum magnetic entropy (ΔS_max) in this material perovskite near room temperature (Tc = 336 K). Furthermore it, from this phenomenological model, we were also able to calculate other properties. the values of the full-width at half-maximum (δT_FWHM), the maximum and the minimum specific heat were found to be, respectively, 10.19 K, 9.41 and −9.19 (J/(Kg K)) under 0.05 T field change. In addition, a relative cooling power (RCP) of about 2.12 J/Kg. Compared to other materials, La_0.67Sr_0.16Ca_0.17MnO₃ appears to be a promising candidate for magnetic cooling near room temperature.