Nonhydrolytic sol-gel synthesis and dielectric properties of ultrafine-grained and homogenized Ba0.70Sr0.30TiO3

• Published in: Ceramics international Vol. 34; no. 1; pp. 45 - 49
• Main Authors: Mao, Chaoliang, Dong, Xianlin, Zeng, Tao, Chen, Heng, Cao, Fei
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Science 2008
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Cross-disciplinary physics: materials science; rheology; Electrotechnical and electronic ceramics; Exact sciences and technology; Materials science; Nanopowders; Nanoscale materials and structures: fabrication and characterization; Physics; Technical ceramics; Plasma; Electrical properties; Dielectric properties; Thermogravimetry; Titanates; Differential thermal analysis; Experimental study; Ultrafine powder; Precursor; Oxide ceramics; Strontium Titanates; Spark discharge; Transmission electron microscopy; Sol gel process; Sintering; Size effect; Barium Titanates; Property structure relationship; Manufacturing; Xerogel; Barium Strontium Titanates Mixed; Nanocrystal; Electroceramics
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2006.08.002

A simple process was used to synthesise nanocrystalline Ba0.70Sr0.30TiO3 (BST) powders via a nonhydrolytic sol-gel method using barium acetate, strontium acetate, titanium tetrabutoxide, ethanol, acetic acid and acetylacetone as starting materials. TG and DTA were used to examine the decomposition behaviour of the xerogel. The particle size of BST was close to 30 nm, calculated by XRD and confirmed by TEM. Using these nanocrystalline BST powders, dense BST ceramics with ultrafine grains were obtained by spark plasma sintering. The grain size effect on the dielectric properties was studied. It was shown that as the grain size decreased, the transition temperature and the dielectric constant decreased and the transition became diffuse. 18 refs.