Abstract
La 0.67Ca 0.33MnO 3 doped with different amounts of V, resulting in the series La 0.67Ca 0.33Mn 1− x V x O 3 [ x = 0.03, 0.06, 0.1, 0.15, 0.25, 0.5] was synthesized by conventional solid-state ceramics route. Heat treatment conditions during synthesis were optimized to have small changes in the Curie temperature ( T C ). The compounds with x > 0.06 were found to have the additional LaVO 4 phase. A quantitative analysis of the extra phase with increase in V doping was investigated by the Rietveld refinement of the X-ray diffraction patterns. Variation of magnetic and magnetocaloric properties at different temperatures and magnetic fields was studied. Magnetocaloric effect has been studied in terms of isothermal magnetic entropy change (Δ S M ). Magnetization was found to change drastically at around 275 K and the isothermal magnetic entropy change was found to peak in the temperature range 265–275 K. With increase in V content, Δ S M initially shows a considerable increase and then a decrease at higher V concentrations.
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