Maximum magnetic entropy change modulated toward room temperature in perovskite manganites La0.7−xNdx(Ca,Sr)0.3MnO3

With Nd3+ doping and Ca2+, Sr2+ modulating in the sol–gel technique, a series of polycrystalline perovskite samples La0.7−xNdx(Ca,Sr)0.3MnO3 (x = 0, 0.05, 0.1, 0.15, 0.20, 0.25) was prepared, their maximum magnetic entropy changes were tuned to room temperature (ΔSH = −1.47 J/kg K at 298 k for La0.45Nd0.25(Ca,Sr)0.3MnO3), an enhancement of the maximum magnetic entropy change (ΔSH = −1.89 J/kg K at 315 k) and its refrigerant capacity (about 45.3 J/kg) had also been obtained under 9 kOe magnetic field variation for La0.55Nd0.15(Ca,Sr)0.3MnO3 contrast to La0.7(Ca,Sr)0.3MnO3.

► The maximum magnetic entropy changes were tuned to room temperature.
► An enhancement of maximum magnetic entropy change had also been obtained.
► The substitution distorted the cubic structure and adjusted bond length and angle.
► The canted spin rearrangement finally modulated the magnetic transition temperature toward room temperature.
► A potential working substance on the refrigeration originated from its easier fabrication and higher chemical stability.