Identification of surface phases on BaTiO/sub 3/-TiO/sub 2/ ceramics

Journal Article · Thu Jan 01 00:00:00 EST 1987 · Am. Ceram. Soc. Bull.; (United States)

OSTI ID:5680614

O'Bryan, Jr, H M

The triangular and hexagonal crystals which form during annealing on the surfaces of ceramics in the BaTiO/sub 3/-TiO/sub 2/ system have been identified as Ba/sub 3/(PO/sub 4/)/sub 2/. The primary source of phosphorus is the TiO/sub 2/ raw material which contains less than or equal to0.2 wt% as P/sub 2/O/sub 5/. During sintering at greater than or equal to 1300/sup 0/C the phosphorus is well distributed, presumably as a glass film at the grain boundaries. After annealing at less than or equal to 1275/sup 0/C the phosphorus concentrates at the surface as Ba/sub 3/(PO/sub 4/)/sub 3/ crystals.

• Research Organization: Grade 1020, NL Industries, Inc., Hightstown, NJ
• OSTI ID: 5680614
• Journal Information: Am. Ceram. Soc. Bull.; (United States), Vol. 66:4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
ANNEALING
CRYSTAL GROWTH
TITANIUM OXIDES
CERAMICS
CHEMICAL COMPOSITION
CRYSTALLIZATION
GLASS
GRAIN BOUNDARIES
PHOSPHORUS OXIDES
SINTERING
SURFACES
VERY HIGH TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
CRYSTAL STRUCTURE
FABRICATION
HEAT TREATMENTS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHOSPHORUS COMPOUNDS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies