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IJERT-EMS

Influence of Grain Size on the Structure, Electrical Properties and the Phase Transition Temperature of Nano La0.72Sr0.28mno3 Perovskite Employing in – Situ Ultrasonic Measurement


Influence of Grain Size on the Structure, Electrical Properties and the Phase Transition Temperature of Nano La0.72Sr0.28mno3 Perovskite Employing in – Situ Ultrasonic Measurement
Authors : M. Vigneswari, K. Sakthipandi, S. Sankarrajan
Publication Date: 07-06-2014

Authors

Author(s):  M. Vigneswari, K. Sakthipandi, S. Sankarrajan

Published in:   International Journal of Engineering Research & Technology

License:  This work is licensed under a Creative Commons Attribution 4.0 International License.

Website: www.ijert.org

Volume/Issue:   Vol. 3 - Issue 6 (June - 2014)

e-ISSN:   2278-0181

Abstract

The solid state reaction method followed by the ball milling technique was used to synthesize the nano sized La0.72Sr0.28MnO3 (LSMO) perovskite samples with different grain size of 43, 35, 30, 23, 16 nm. The rhombohedral structures present in the prepared perovskites were explored through the X – ray diffraction (XRD) measurements. The functional groups present in nano sized LSMO perovskites were obtained through the recorded Fourier Transform Infrared spectroscopy (FTIR) pattern. The microscopic studies revealed that the particle sizes of the nano LSMO perovskite samples were 10 – 130 nm. The temperature dependence of the measured electrical properties indicates the semiconductor nature of nano LSMO perovskite sample. The ultrasonic velocities and attenuation were further measured at a frequency of 20 MHz over a wide range of temperatures from 300 to 400 K. The occurrence of ferro-paramagnetic transition temperature (Tc) was explored through the observed anomalous behavior in ultrasonic velocities, attenuations and elastic moduli. Moreover, the observation made from the XRD pattern of nano LSMO perovskite samples were in line with the peak broadening in the ultrasonic studies at the phase transition. The particle size dependent critical constants for the density, ultrasonic velocities and attenuations (both longitudinal and shear) were also obtained

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