Method for producing crystalline complex perovskite compounds

Details Method for producing crystalline complex perovskite compounds Method for producing crystalline complex perovskite compounds

1988-01-07

1989-08-01

Cooper, Jack

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423593, 501135, C01G 3300, C01G 3500

Patent

active

048531995

ABSTRACT:
A method for producing crystalline complex perovskite compounds from starting compounds of at least one metal such as Ca, Ba or Sr, at least one metal such as Mg, Zn, Ni or Co and at least one metal such as Ta or Ni. The respective compounds are selected from oxides, hydroxides, hydrous oxides, and water-soluble organic compounds and inorganic salts of the respective metals. The water-soluble organic compounds and inorganic salts are capable of yielding metal oxides, hydroxides and hydrous oxides by hydrolysis. These starting compounds are heated at certain temperatures in an alkaline aqueous solution to obtain the perovskite compound at significantly low reaction temperatures of at least 95.degree. C. Prior to the heating, the starting compounds may be treated in the alkaline aqueous solution at temperatures lower than 95.degree. C. to form a uniformly mixed amorphous phase of the compounds and then heated.

REFERENCES:
patent: 3464785 (1969-09-01), Galasso
patent: 4487842 (1984-12-01), Nomura et al.
patent: 4675123 (1987-06-01), Tsunooka et al.
Galasso et al, "Ordering in Compounds of the A(B'.sub.0.33 Ta.sub.0.67)O.sub.3 Type", Inorganic Chemistry, p. 482-484.

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