| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1618010 | Journal of Alloys and Compounds | 2010 | 6 Pages |
The La0.65Ca0.35MnO3, La0.65Ca0.30Pb0.05MnO3 and La0.65Ca0.30Pb0.05Mn0.9Cu0.1O3 compounds, prepared by the sol–gel method and sintered in air at 1100 °C for 24 h, have been investigated by Magnetic Properties Measurements System (MPMS) to explore the effects of A- and B-site cation doping. From the measurements, the Curie temperatures (TC) and the isothermal magnetic entropy changes (−ΔSM) were determined. The Curie temperature of La0.65Ca0.35MnO3 compound was found to be 273 K. The Curie temperature increases to 286 K for the La0.65Ca0.30Pb0.05MnO3 compound due to the substitution of Ca by a small amount of Pb. However, replacing 10% of Mn with Cu (La0.65Ca0.30Pb0.05Mn0.9Cu0.1O3) leads to a reduction in the Curie temperature to 223 K. For the field change of 1 T, while the maximum magnetic entropy change for the sample La0.65Ca0.35MnO3 was found to be 4.1 J/kg K it decreases down to 2.6 J/kg K and 3.2 J/kg K for the La0.65Ca0.30Pb0.05MnO3 and La0.65Ca0.30Pb0.05Mn0.9Cu0.1O3 samples, respectively.
Research highlightsThe Curie temperature of La0.65Ca0.35MnO3 compound was found to be 273 K. For the field change of 1 T, the maximum magnetic entropy change value for the sample La0.65Ca0.35MnO3 was found to be 4.1 J/kg K. The Curie temperature and maximum magnetic entropy change value of the La0.65Ca0.35MnO3 sample obtained in this study are higher than most of the values published in the literature for the same compound. The Curie temperature increases to 286 K for La0.65Ca0.30Pb0.05MnO3 compound due to the substitution of Ca by a small amount Pb.
