Enhancement of magnetocaloric properties in (1 − x)La{sub 0.7}Ca{sub 0.2}Sr{sub 0.1}MnO{sub 3}/xLa{sub 0.7}Ca{sub 0.15}Sr{sub 0.15}MnO{sub 3} composite system (0 ≤ x ≤ 1)

Highlights: • The parent compounds were elaborated by solid-state reaction. • Continuous curves were investigated by the numerical calculations in (1 − x)La{sub 0.7}Ca{sub 0.2}Sr{sub 0.1}MnO{sub 3}/xLa{sub 0.7}Ca{sub 0.15}Sr{sub 0.15}MnO{sub 3} system. • The optimum magnetocaloric effect has been found for the composition with x = 0.45. - Abstract: The present work reveals an especial agreement between the experimental results and the continuous curves investigated by the numerical calculations in (1 − x)La{sub 0.7}Ca{sub 0.2}Sr{sub 0.1}MnO{sub 3}/xLa{sub 0.7}Ca{sub 0.15}Sr{sub 0.15}MnO{sub 3} composite system. Moreover, the ability to adjust the magnetic entropy change in a large temperature range is revealed to be possible by the mixture of both individual phases La{sub 0.7}Ca{sub 0.2}Sr{sub 0.1}MnO{sub 3} and La{sub 0.7}Ca{sub 0.15}Sr{sub 0.15}MnO{sub 3}. Our samples have been synthesised using the solid state method. Rietveld refinements of the X-ray diffraction patterns show that both samples are single phase. The Curie temperature T{sub C} is found to be 308 K and 338 K for La{sub 0.7}Ca{sub 0.2}Sr{sub 0.1}MnO{sub 3} and La{sub 0.7}Ca{sub 0.15}Sr{sub 0.15}MnO{sub 3}, respectively. Moreover, the magnetic entropy change and the Relative Cooling Power (RCP) values were estimated. We have shown that the optimum magnetocaloric effect at μ{sub 0}H = 2T has been found for the composition with x = 0.45, which exhibits a table-like ΔS curve with a peak value slightly lowered and strongly expanded when comparing with the parent compounds.