Phase Transition of La0.62Sr0.38MnO3 Perovskite Manganites

Sakthipandi K; Selvam M

doi:10.34256/famr1915

Sakthipandi K Department of Physics, Sethu Institute of Technology. Kariapatti 626 115, Tamil Nadu, India
Selvam M Centre for Nano Science and Technology, K S Rangasamy College of Technology, Tiruchengode 637215, Tamil Nadu, India

DOI: https://doi.org/10.34256/famr1915

Keywords: Perovskite, Ultrasonic velocity, Grain size, Curie temperature

Abstract

Bulk and nano La_0.62Sr_0.38MnO₃ perovskite manganite samples were prepared using solid state and sonochemical reaction respectively. The ultrasonic velocities measurement was made on prepared samples using ultrasonic through transmission method, at a fundamental frequency of 5 MHz over wide range of temperatures. The temperature dependence of the ultrasonic parameters shows an interesting anomaly in bulk and nano perovskite samples. The observed dramatic softening and hardening in sound velocities are related to phase transitions. Further, a decrease in grain size in the nanostructured sample leads to a shift in the ferromagnetic transition temperature (T_C) from 375 to 370 K.

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