Perovskite titanium-type composite oxide particle and production process thereof
AssigneeShowa Denko K.K.
InventorsMasahiro Ohmori, Akihiko Kotera
Life of this patent
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Abstract
A perovskite titanium-containing composite oxide particle have a composition represented by general formula (I), where the specific surface area is about 10 to about 200 m2/g, the specific surface area diameter D1 of the primary particles defined by formula (II) is about 10 to about 100 nm, and a D2/D1 ratio of the average particle size D2 of secondary particles to D1 is about 1 to about 10: M(TiO3) (I) wherein M is at least one of Ca, Sr, Ba, Pb, or Mg D1=6/ρS (II) wherein ρ is the density of the particles, and S is the specific surface area of the particles is disclosed. The present invention has a small particle size and excellent dispersion properties, so that the particle is suitable for application to functional materials.
Claims7
A sol comprising dispersed perovskite titanium-containing composite oxide particle having a composition represented by general formula (I), wherein the specific surface area is about 10 to about 200 m2/g, the specific surface area diameter D1 of primary particles defined by formula (II) is about 10 to about 100 nm, and a D2/D1 ratio of the average particle size D2 of secondary particles to D1 is about 1 to about 10:
- M(TiO3) (I)
- wherein M is at least one of Ca, Sr, Ba, Pb, or Mg and
- D1=6/ρS (II)
- wherein ρ is the density of the particles, and S is the specific surface area of the particles.
A process for producing a sol in which a perovskite titanium-containing composite oxide particle represented by general formula (I) is dispersed, comprising the step of allowing a titanium oxide particle comprising a brookite crystalline form to react with a metal salt comprising at least one of Ca, Sr, Ba, Pb, or Mg in a liquid phase:
- M(TiO3) (I)
- wherein M is at least one of Ca, Sr, Ba, Pb, or Mg.
A process for producing a sol in which a perovskite titanium-containing composite oxide particle represented by general formula (I) is dispersed, comprising the step of allowing a titanium oxide sol prepared by subjecting a titanate to hydrolysis in an acid solution to react with a metal salt comprising at least one of Ca, Sr, Ba, Pb, or Mg in a liquid phase:
- M(TiO3) (I)
- wherein M is at least one of Ca, Sr, Ba, Pb, or Mg.
Dependencies are inferred from the claim text.