Spray drying of metal alkoxide sol for strontium titanate ceramics
- Regional Research Lab., Trivandrum (India)
Conditions for obtaining a stable sol in an isopropyl alcohol-water medium containing titanium isopropoxide and strontium nitrate, and acetic acid as a modifier, have been described. Spray drying of the sol results in submicrometer spherical agglomerates which on further thermal decomposition yield submicrometer particles of strontium titanate at temperatures as low as 500 C. The thermal decomposition characteristics of the spray-dried precursor and the development of strontium titanate phase have been discussed. Calcined precursor powder possesses a specific surface area of 12 m{sup 2}/g, a compaction density of 57%, and a sintered density of > 98%. The optimum sintering temperature of such a powder was 1450 C, which resulted in a sintered grain size around 1.5 {mu}m. Further, such a sintered sample had a dielectric constant of 260 and a loss factor of 0.008 at 1 kHz. This method appears to be very convenient with respect to handling of stable sols and thus avoids the usual difficulties regarding extended gelation as well as inhomogeneous precipitation.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 142242
- Journal Information:
- Journal of the American Ceramic Society, Vol. 77, Issue 1; Other Information: PBD: Jan 1994
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fabrication and characterization of pure homogeneous PZT ceramics from sol-gel derived powders
Development of a Thermal Spray, Redox Stable, Ceramic Anode for Metal Supported SOFC