オクタノール/アセトニトリル溶液中での複合アルコキシド法によるチタン酸鉛微粒子の合成とその誘電特性

概要

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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-C_3H_7)_2 and Ti(OC_2H_5)_4. The synthetic reactions of the complex alkoxide were carried out in octanol for 2-72h at 70℃, and the successive hydrolysis and condensation reactions were performed at water concentrations of 0.1-2.3 mol/dm^3 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/dm^3 and acetonitrile concentrations of 15-20 vol% at a total monomer concentration of 0.05 mol/dm^3. The particles were subjected to heat treatment at various temperatures. The particles started to crystallize into a tetragonally perovskite structure at 200℃, and transformed into a single phase at 750℃. Dielectric constants of the particles heat-treated at 500-750℃ 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.
社団法人日本セラミックス協会の論文
1998-10-01