Review of magnetocaloric properties in lanthanum manganites

For the efficient implementation of magnetic refrigeration technology in either industrial or domestic ways it is important to review the information available in the literature. This work presents a summary of 231 compounds based on lanthanum manganites with the formula (La(1-x)A(x-y)B(y))MnO3, where A and B can be: Ag, Ba, Bi, Na, Ca, Ca, Cd, Sr, K, Te, Ce, Pb, Pr, Nd, Gd, Dy, Eu, square. The magnetocaloric properties of these compounds have been reported and discussed as a function of the synthesis methods and the substituent cations. A relevant finding deals with the optimum magnetocaloric materials are those that present the highest magnetic entropy change (Delta S-M), and high relative cooling power (RCP). Also, the Curie or operating temperature (T-C) needs to be the closest or lower than that of the environment, 298 K. The synthesis methods, which influence in some way the magnetocaloric properties, are also analyzed. Most of the manganites found in the literature presented in this work, have been reported to present a ferromagnetic-paramagnetic transition of second order.

Automated summary

Efficient implementation of magnetic refrigeration technology relies on reviewing available information in literature. This study presents a summary of the magnetocaloric properties of 231 compounds based on lanthanum manganites, discussing the influence of synthesis methods and substituent cations.