Cover Page July-2012, Current Issue-Advanced Materials Letters

Advanced Materials Letters

Volume 3, Issue 3, Pages 220-225, July 2012, Current Issue
About Cover


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

Maneesha Gupta1, 2,*, Poonam Yadav3, Wasi Khan1, Ameer Azam1,4, Alim H. Naqvi1, R.K. Kotnala3

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

E-mail: maneesha.nano@gmail.com

Abstract

We have synthesized La1-xSrxMnO3 (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

Current Issue

Wearable Healthcare Devices


Nano-Graphene and Its Derivatives for Fabrication of Flexible Electronic Devices: A Quick Review


Natural Fibers as Viable Sources for the Development of Structural, Semi-Structural, and Technological Materials – A Review


Geometrical Characterization of Wire-and-Arc Additive Manufactured Steel Element


Plasma Activated Water Generation and its Application in Agriculture


Development of Advanced Electrode Materials on Porous Silicon for Micropower Formic Acid-Oxygen Fuel Cells 


Water Management within Tragacanth gum-g-polyitaconic Acid Hydrogels


Synthesis and Characterization of Humic Acid-coated Fe3O4 Nanoparticles for Methylene Blue Adsorption Activity


Synthesis and characterization of thermally stable flame retardant thermoplastic polyphosphazenes


Synthesis of Rod-coil Molecules bearing Oligo-Phenylene Vinylene Motifs: Effect of PEO Chain Lengths on the Evolution of Nanostructures Morphology and their Photophysical Properties


Dielectric Properties of Cu based Polymeric Composites in X-band of Microwave Frequency


Critical Association Concentration of Dansyl-Poly (acrylic acid) Synthetized by Redox Polymerization Followed by an Esterification in Aqueous Solution: Spectrophotometric and Tensiometric Studies


Influence of Iron Doping on Structural and Optical Properties of Nickel Oxide Nanoparticles


Upcoming Congress

Knowledge Experience at Sea TM