Abstract
The La0.65Ca0.30Pb0.05Mn0.9B0.1O3 (A=Co, Ni, Cu and Zn) manganites have been prepared via sol–gel method and sintered at 1100°C for 24h. The aim of the study was to investigate B-site cation doping effects on the magnetic properties. XRD analysis reveals that all samples have rhombohedral structure belonging to the R3‾c space group. The Curie temperature decreases as a result of Mn replacement with Co, Ni, Cu and Zn, respectively. The maximum magnetic entropy changes of the samples doped with Co, Ni, Cu and Zn for a field change of 1T were found to be 2.10, 1.71, 3.20 and 1.42J/kgK respectively. For La0.65Ca0.30Pb0.05MnO3, this is 2.60J/kgK. The maximum magnetic entropy change increases as a result of Cu doping. Additionally, the metal–insulator transition temperature decreases due to the B-site doping.
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