Peroxide route to synthesize calcium titanate powders of different composition

✍ Scribed by G. Pfaff

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 562 KB
• Volume: 9
• Category: Article
• ISSN: 0955-2219
• DOI: 10.1016/0955-2219(92)90064-k

✦ Synopsis

The calcium titanates CaTiO 3, Ca3Ti20 7 and Ca,,Ti3010 can be synthesized by the wet ehemieal peroxide route. The)qrst step of the preparation is the precipitation ~?(peroxo-precursors o)C definite stoichiometrv which are tran,@)rmable into the corresponding titanates by thermal decomposition. The resulting uttra-~ne, phase-pure calcium titanate powders have only a small impurity content. They are t~erv sinter active above 1200°C. The rate of dens([ieation during sintering o[eompacts is #nproved in the sequence Ca3Ti207 < Ca4Ti3010 < CaTiO 3, considering the green densities, the densities at a given time and the theoretical densities of the titanates for the cah'ulations. The phase CaTi409 can be obtained q['ter thermal degradation o['a corresponding peroxoprecursor at temperatures below 700~'C. There are als'o hMieations 0/ the jormation 0[ the phase CaTizO 5 below 700~C. A phase CazTiO 4 can not be s.t,nthesized using the peroxide route.