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In this paper, the magnetic properties and the magnetic entropy of LaFe11.5Al1.5Bx (x = 0, 0.1, 0.2 and 0.3) and LaFe11.5Al1.5Cy (y = 0.1, 0.2, 0.3, 0.4 and 0.5) compounds have been studied. All the compounds crystallize in the cubic NaZn13-type structure. By introducing interstitial atoms B or C, the magnetic ground state is changed from the antiferromagnetic (AFM) to the ferromagnetic (FM) state. And, the Curie temperature (TC) significantly enhanced with increasing the content of interstitial atoms (B or C). Compared with the obvious variation in Curie temperature, the saturation magnetization (MS) increased slightly. It is worth noting that the magnetic transition changed from weak first-order to second-order with increasing boron or carbon. All the LaFe11.5Al1.5 borides and carbides exhibit a considerable magnetic entropy change, the maximum magnetic entropy change (-Delta S-M) reach to 9.6 J/kg K for LaFe11.5Al1.5B0.1 and 10.8 J/kg K for LaFe11.5Al1.5C0.2 under a magnetic field change of 0-5 T. (C) 2015 Elsevier B.V. All rights reserved.
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