Perovskite titanium-type composite oxide particle and production process thereof

Abstract

A perovskite titanium-containing composite oxide particle has a composition represented by general formula (I), wherein the specific surface area is about 10 to about 200 m 2 /g, the specific surface area diameter D 1 of the primary particles as defined by formula (II) is about 10 to about 100 nm, and the ratio D 2 /D 1 of the average particle size D 2 of the secondary particles to D 1 is about 1 to about 10: M(TiO 3 )  (I) (wherein M is at least one of Ca, Sr, Ba, Pb, or Mg) D 1 =6/ρS  (II) (wherein ρ is the density of the particles, and S is the specific surface area of the particles.) The perovskite titanium-containing composite oxide particle of the present invention shows a small particle size and excellent dispersion properties, so that the particle is suitable for the application to functional materials such as a dielectric material and a piezoelectric material, a memory, and a photocatalyst.

1 . A functional material obtainable from a perovskite titanium-containing composite oxide particle having a composition represented by general formula (I), wherein the specific surface area is 28 to about 200 m 2 /g, the specific surface area diameter D 1  of primary particles defined by formula (II) is about 10 to 50 nm, and a D 2 /D 1  ratio of the average particle size D 2  of secondary particles to D 1  is about 1 to about 10:  
         M(TiO 3 )  (I)  
       wherein M is at least one of Ca, Sr, Ba, Pb, or Mg,  
           D 1=6/ρ S   (II)  
       wherein ρ is the density of the particles, and S is the specific surface area of the particle, wherein the functional material is a dielectric material, a laminated ceramic capacitor, a piezoelectric material, a memory or a photocatalyst.