Process for producing perovskite-type oxides of the ABO.sub.3 ty

Details Process for producing perovskite-type oxides of the ABO.sub.3 ty Process for producing perovskite-type oxides of the ABO.sub.3 ty

1988-01-15

1989-10-17

Cooper, Jack

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252 629, 423593, 501134, 501135, C01G 2300, C01G 2500

Patent

active

048745987

ABSTRACT:
A process for producing a perovskite-type oxide of the ABO.sub.3 type is disclosed. A solution of an element A (Pb, Ca, Sr and/or La) and an element B (Ti and/or Zr) is brought into contact with oxalic acid in the presence of an alcohol to precipitate oxalic acid salts; the acid radicals in the solution are neutralized with an amine or ammonia; the resulting precipitate is then subjected to calcination.
A fine-grained ferroelectric oxide having a sharp grain size distribution can be produced, with its chemcial composition being exactly controlled. This oxide is suitable for use as a piezoelectric, pyroelectric or ferroelectric material.

REFERENCES:
patent: 4019915 (1977-04-01), Miyauchi et al.
patent: 4547355 (1985-10-01), Uedaira et al.
patent: 4696810 (1987-09-01), Shirasaki et al.
Patent Abstracts of Japan, vol. 11, No. 268 (C-444) [2715], Aug. 29, 1987, "Production of ABO3 Perovskite Type Oxide".
Patent Abstract of Japan, vol. 11, No. 101 (C-413) [2548], Mar. 31, 1987., "Production of Perovskite Type Oxide".
Patent Abstract of Japan, vol. 8, No. 126 (C-228) [1563], Jun. 13, 1984, "Manufacture of Perovskite Type Oxide Powder".

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