FINE-GRAINED ALKALI-EARTH TITANATES AND METHOD OF PRODUCING SAID TITANATES USING TITANIUM OXIDE PARTICLES Russian patent published in 2009 - IPC C01G23/00 C01F11/00 C04B35/465 

FIELD: chemistry.

SUBSTANCE: method of producing alkali-earth titanates involves reacting compounds of alkali-earth metals with particles of titanium dioxide in a solid phase reaction at temperature below 700°C. The titanium dioxide particles have specific surface area (BET) of over 50 m²/g and contain less than 1.5 wt %, preferably less than 0.3 wt %, most preferably less than 0.08 wt % sulphate relative TiO₂. Titanium dioxide particles used can contain less than 1000 particles per million of chloride and less than 1000 particles per million of carbon. The obtained alkali-earth titanate has specific surface area (BET) ranging from 5 to 100 m²/g, and does not contain hydroxyl groups, embedded into the crystal lattice. Specific surface area (BET) of an uncrushed sample of alkali-earth titanate after calcination ranges from 5 to 50, preferably from 15 to 40 m²/g. A powdered composition for producing alkali-earth titanate, microelectronic element and method of obtaining it are proposed.

EFFECT: invention allows for obtaining fine-grained, high-purity alkali-earth titanates.

42 cl, 5 dwg, 8 ex