Influence of Particle Size on Electrical Transport Properties of La0.67Sr0.33MnO3 Manganite System
Authors: Venkataiah, G.; Lakshmi, Y. Kalyana; Prasad, V.; Reddy, P. Venugopal
Source: Journal of Nanoscience and Nanotechnology, Volume 7, Number 6, June 2007 , pp. 2000-2004(5)
Publisher: American Scientific Publishers
Key:
- Free Content
- New Content
- Subscribed Content
- Free Trial Content
- Free Content
- New Content
- Subscribed Content
- Free Trial Content
Abstract:
A systematic investigation of lanthanum-based manganite, La0.67Sr0.33MnO3, has been undertaken with a view to understand the influence of varying particle sizes on electrical transport properties. With a viewto obtain materials with varying particle size, they were prepared by sol-gel route, sintering at four different temperatures. The samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD data has been analyzed by Rietveld refinement technique and it has been confirmed that the materials have rhombohedral crystal structure with R3c space group. Metal-insulator transition temperatures (TP) were found to decrease continuously with decreasing particle size where as ferro to paramagnetic transition temperatures (TC) are found to remain constant. The magnetoresistance (MR) values are found to increase with decreasing particle size. With a viewto understand the conduction mechanism, the electrical resistivity data have been analyzed both in the ferromagnetic metallic (T < TP) as well as high temperature paramagnetic insulating (T > TP) regions.Keywords: NANOPARTICLE; SOL-GEL PROCESS; RESISTIVITY; MAGNON; POLARON
Document Type: Research article
DOI: 10.1166/jnn.2007.757
Key:
- Free Content
- New Content
- Subscribed Content
- Free Trial Content
- Free Content
- New Content
- Subscribed Content
- Free Trial Content
Click here for Page Help