Abstract
Pure and Ag-doped BaTiO 3 nanopowders were prepared by spray pyrolysis. Precursor powders, prepared from a spray solution with citric acid and ethylenediaminetetraacetic acid (EDTA) as chelating agents, had large, hollow particles irrespective of Ag doping. Both pure and Ag-doped powders had partially aggregated particles after post-treatment at 900°C that could be easily milled to nanoparticles. The mean sizes of the pure and Ag-doped BaTiO 3 particles were 75 and 91 nm, respectively. The Ag-doped particles were mainly of cubic BaTiO 3 crystal structure, with small Ag phases observed. High-density BaTiO 3 pellets were formed by sintering the powders at the low temperature of 1000°C. The silver was uniformly distributed in a tetragonal BaTiO 3 phase without phase separation in the doped pellet. The dielectric constants of the pellets formed from the pure and Ag-doped BaTiO 3 powders were 1826 and 2400, respectively.
| Original language | English |
|---|---|
| Pages (from-to) | 2071-2077 |
| Number of pages | 7 |
| Journal | Ceramics International |
| Volume | 38 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2012 Apr |
| Externally published | Yes |
Bibliographical note
Funding Information:This study was supported by a grant (M2009010025) from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy (MKE), Republic of Korea. This study was supported by Seoul R & BD Program (WR090671). This study was supported by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korea government (MEST) (No. 2009-0074023).
Keywords
- Barium titanate
- Dielectric material
- Nano powder
- Spray pyrolysis
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry