Study of phase transition in Cu-doped La0.7Sr0.3MnO3 perovskite manganite materials by ultrasonic technique

Abstract La 0.7 Sr 0.3 Mn 1−x Cu x O 3 perovskite manganite materials with a composition of x  = 0.05, 0.10 and 0.15 were obtained using solid state reaction technique. The measurement of ultrasonic velocity over a wide range of temperature reveals the short range ferromagnetic to the antiferromagnetic transition temperature (T C ) at 358, 341 and 328 K for the perovskites with the composition x  = 0.05, 0.10 and 0.15 respectively. Turning of T C was achieved from 370 ( x  = 0) to 328 ( x  = 0.15) K which helps to obtain the new cathode materials for solid-oxide fuel cell.