Abstract
An attempt was made to produce lead titanate particles with a sol-gel process which adopted the hydrolysis and condensation reactions of complex alkoxide prepared from Pb (O-i-C3H7)2 and Ti (OC2H5)4. The synthetic reactions of the complex alkoxide were carried out in octanol for 2-72h at 70°C, and the successive hydrolysis and condensation reactions were performed at water concentrations of 0.1-2.3 mol/dm3 at an ambient temperature in octanol-butanol solvents containing acetonitrile as a cosolvent. Size distributions of the lead titanate particles formed were measured with dynamic light-scattering. Selection of reaction conditions enabled the synthesis of spherical particles with average diameters less than 100 nm in ranges of water concentrations of 0.5-2.0 mol/dm3 and acetonitrile concentrations of 15-20 vol% at a total monomer concentration of 0.05 mol/dm3. The particles were subjected to heat treatment at various temperatures. The particles started to crystallize into a tetragonally perovskite structure at 200°C, and transformed into a single phase at 750°C. Dielectric constants of the particles heat-treated at 500-750°C were close to that of bulk, whereas the crystallite sizes in the particles were similar to the sizes of the particles produced in the reactions.
Original language | English |
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Pages (from-to) | 1012-1016 |
Number of pages | 5 |
Journal | Journal of the Ceramic Society of Japan |
Volume | 106 |
Issue number | 10 |
DOIs | |
Publication status | Published - 1998 Oct |
Keywords
- Complex alkoxide
- Condensation
- Crystallite size
- Dielectric constant
- Hydrolysis
- Lead titanate
- Spherical particle
ASJC Scopus subject areas
- Ceramics and Composites
- Chemistry(all)
- Condensed Matter Physics
- Materials Chemistry