Low Temperature Synthesis And Magneto Resistance Study Of Nano La1-xSrxMnO3 (x = 0.3, 0.33, And 0.4) Perovskites

¹Center of Excellence in Materials Science (Nanomaterials), Department of Applied Physics, Z.H.C.E.T, A.M.U., Aligarh 202002, India

²Space Applications Center, ISRO, Ahmedabad 380 015, India

³National Physical Laboratory, Pusa Road, New Delhi 110 012, India

⁴Centre of Nanotechnology, King Abdulaziz University, Jeddah, Saudi Arabia

Adv. Mater. Lett., 2012, Current Issue, 3 (3), pp 220-225

DOI: 10.5185/amlett.2012.1309

Publication Date (Web): Jun 10, 2012

Copyright © IAAM-VBRI Press

E-mail: maneesha.nano@gmail.com

Abstract

We have synthesized La_1-xSr_xMnO₃ (with x=0.3, 0.33 & 0.4) perovskite nanoparticles using mild sol-gel technique at low temperature and thereby studied the effect of nanosize on magnetoresistance. These samples were characterized using TGA/DSC, XRD, TEM, FTIR and temperature dependent magnetoresistance (MR) measurements. Powder X-ray diffraction (XRD) result confirms the formation of pure crystalline phase with rhombohedral symmetry in R-3C space group. Crystallite size increases with increase in Sr concentration. TEM analysis further supports the nanosized particles in the samples which lie in the range of 20-30 nm. Fourier transform infrared (FTIR) spectroscopy shows a broad peak at 615 cm^-1 for all the samples gives an evidence for the formation of metal oxygen bond organized in to MnO6 octahedral. The steep change in magnetoresistance (MR) at low field at low temperature is observed which is attributed to the alignment of the spins, while in the high field MR is due to the grain boundaries effect at low temperature. In the series studied, 33% Sr doped sample shows higher MR both at low temperature (-17.15) and room temperature (-3.07) than their counter parts.

Keywords

Manganite, sol-gel process, magnetoresistance, citric acid