Process for the preparation of complex perovskite type compounds

Details Process for the preparation of complex perovskite type compounds Process for the preparation of complex perovskite type compounds

1989-06-30

1990-04-17

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

501134, 502252, 423593, 423594, C04B 3500

Patent

active

049180355

ABSTRACT:
The present invention provides a process for producing powder of complex perovskite type compounds by using metal alkoxides. In the prior art, methods were known for synthesizing crystalline powder of simple perovskite type compounds such as BaTiO.sub.3. According to the conventional methods, however, when synthesizing a complex perovskite type compound having two atoms of different valences at the B site of perovskite structure by hydrolyzing metal alkoxides, there could be obtained only amorphous powder, and for crystallizing it, heating to a temperature of around 600.degree. to 800.degree. C. was necessary.
According to the process of this invention, it is possible to synthesize the crystalline complex perovskite type compounds at a low temperature of around 100.degree. C., which is 500.degree. to 700.degree. C. lower than the temperature required in the conventional methods, by adjusting the amount of water added according to the type of the solvent used and controlling the reaction temperature at a specified level or higher.

REFERENCES:
patent: 4543341 (1985-09-01), Barringer et al.
patent: 4606906 (1986-08-01), Ritter et al.
patent: 4636248 (1987-01-01), Ogata et al.
patent: 4636378 (1987-01-01), Pastor et al.
patent: 4696810 (1987-09-01), Shirasaki et al.
Smith et al, "Preparation and Characterization of Alkoxy-Derived SrZrO.sub.3 and SrTiO.sub.3 ", J. of Am. Cer. Soc., vol. 53, No. 2 (1969) pp. 91-95.

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