D. Johnson—contributing editor
Reverse Micellar Route to Nanocrystalline Titanates (SrTiO3, Sr2TiO4, and PbTiO3): Structural Aspects and Dielectric Properties
Article first published online: 15 FEB 2006
Journal of the American Ceramic Society
Volume 89, Issue 4, pages 1326–1332, April 2006
How to Cite
Ahmad, T. and Ganguli, A. K. (2006), Reverse Micellar Route to Nanocrystalline Titanates (SrTiO3, Sr2TiO4, and PbTiO3): Structural Aspects and Dielectric Properties. Journal of the American Ceramic Society, 89: 1326–1332. doi: 10.1111/j.1551-2916.2005.00886.x
- Issue published online: 15 FEB 2006
- Article first published online: 15 FEB 2006
- Manuscript No. 20935. Received August 30, 2005; approved November 7, 2005.
Nanoparticles of strontium titanates (SrTiO3, Sr2TiO4) and lead titanate (PbTiO3) have been obtained using reverse micelles as nanoreactors. Powder X-ray diffraction studies of the powders after calcining at 800°C show monophasic SrTiO3, Sr2TiO4, and PbTiO3. X-ray line broadening studies and transmission electron microscopic studies show spherical grains of 30–40 nm size for strontium titanates, while PbTiO3 is obtained in the form of nanorods. The dielectric constant of SrTiO3 and Sr2TiO4 is found to be 90 and 30, respectively, (at 100 kHz) for samples sintered at 1000°C. PbTiO3 shows a dielectric constant of 160 (at 100 kHz) after sintering at 900°C. The dielectric constant of Sr2TiO4 (with temperature) is highly stable. The temperature variation studies of the dielectric constant of PbTiO3 show a ferroelectric phase transition at 490°C (1 kHz). The Tc varies with frequency and is found to decrease to 470°C at 100 kHz.