Perovskite titanium-type composite oxide particle and production process thereof

Abstract

A perovskite titanium-containing composite oxide particle having a composition represented by general formula (I), where the specific surface area is about 10 to about 200 m 2 /g, the specific surface area diameter D 1 of primary particles defined by formula (II) is about 10 to about 100 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 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.

1 - 16 . (canceled)  
     
     
         17 . A dielectric material comprising 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        D 1=6/ρ S    (II)    wherein ρ is the density of the particles, and S is the specific surface area of the particles.    
     
     
         18 . A piezoelectric material comprising perovskite titanium-coating 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        D 1=6/ρ S    (II)    wherein ρ is the density of the particles, and S is the specific surface area of the particles.    
     
     
         19 . A memory comprising 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        D 1=6/ρ S    (II)    wherein ρ is the density of the particles, and S is the specific surface area of the particles.    
     
     
         20 . A photocatalyst comprising 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        D 1=6/ρ S    (II)    wherein ρ is the density of the particles, and S is the specific surface area of the particles.