Process for producing powder material for lead perovskite ceramic
AssigneesSakai Chemical Industry Co., Ltd., National Institute for Research in Inorganic Materials
InventorsYasuhiko Terada, Kazunobu Abe, Hajime Uno, Shinichi Shirasaki
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Abstract
A process for producing a powder material for niobium-containing lead perovskite ceramics represented by the general formula: PbA.sub.x Nb.sub.1-x O.sub.3, wherein X=1/2 or 1/3, A represents at least one element selected from the group consisting of Fe, Co, Cr, Ni, Mn, Mg, Zn, Cd, Zr, In, Cu and Hf. A dried mixture of a sol or a suspension of a hydroxide a component A which has a lower activity than Pb and a niobic acid sol is first calcinated. A Pb compound is then added with the mixture and the resultant mixture is calcinated again.
Claims5
A process for producing a powder material for lead perovskite ceramics represented by the formula:
- PbA.sub.x Nb.sub.1-x O.sub.3
- wherein x equals 1/2 or 1/3 and A represents at least one element selected from the group consisting of Fe, Co, Cr, Ni, Mn, Mg, Zn, Cd, Zr, In, Cu and Hf, said process comprising the steps of calcining a dried mixture of a compound of A and a niobic acid sol at a temperature of about 400.degree.-900.degree. C.;
- adding a Pb compound to said calcined mixture;
- and calcining the resultant mixture at a temperature of about 400.degree.-900.degree. C.
Dependencies are inferred from the claim text.