Synthesis and characterization of barium strontium titanate nano powders by low temperature ambient pressure sol process

abstract

Crystalline (Ba (x) Sr(1-x) TiO(3)) (x = 0, 0.5 0.8 and 1) nanosized powders is synthesized by an ambient pressure and low temperature sol process. The influence of Ba/Sr ratio, temperature, pH and reflux time on the phase formation and morphology of (Ba (x) Sr(1-x) TiO(3)) powders is assessed. Amorphous powders are obtained at temperatures lower than 90 A degrees C and crystalline, stoichiometric and monophasic Ba (x) Sr(1-x) TiO(3) (x = 0, 0.5, 0.8 and 1), powders are synthesized at 95 A degrees C. Under identical preparation conditions, the powder particle size depends on the Ba/Sr ratio. High values of pH decrease the particle size. For reflux times lower than 2 h the particle size decreases with increasing of reflux time, reflecting the dominant role of the nucleation step. For reflux times higher than 2 h the growth step becomes dominant and the particle size increases with the increase of reflux time.

keywords

LARGE-SCALE SYNTHESIS; HYDROTHERMAL SYNTHESIS; PARTICLE-SIZE; DIELECTRIC-PROPERTIES; BATIO3; PHASE; MORPHOLOGY; SRTIO3

subject category

Chemistry; Science & Technology - Other Topics; Materials Science

authors

Wu, AY; Vilarinho, PM; Gonzalez, M

our authors

acknowledgements

Financial support from FCT (POCTI/CTM/47285/2002), FEDER and the European Network of Excellence, FAME under the contract FP6-500159-1 is acknowledged.

Share this project:

Related Publications

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".