Processing and characterization of BaTi sub 4 O sub 9
- Dept. of Ceramic Engineering, Ohio State Univ., Columbus, OH (US)
This paper reports on BaTi{sub 4}O{sub 9} powder prepared by calcining BaCo{sub 3} and TiO{sub 2} powders sintered to over 97% of theoretical density. Less than 5% Ba{sub 2}Ti{sub 9}O{sub 20} occurred as a second phase in pure BaTi{sub 4}O{sub 9}, and Al{sub 2}O{sub 3} impurities from processing formed isolated hollandite ({approximately}BaAl{sub 2}Ti{sub 6}O{sub 16}) grains, which were identified by fringes in bright-field TEM images. For pure BaTi{sub 4}O{sub 9} at 1 MHz, a dielectric loss (tan {delta}) of 5 {times} 10{sup {minus} 4} and dielectric constant of 39 were recorded. Hollandite impurities were found to increase tan {delta} by 2 orders of magnitude, whereas firing in oxygen decreased tan {delta} by an order of magnitude.
- OSTI ID:
- 7008931
- Journal Information:
- Journal of the American Ceramic Society; (USA), Journal Name: Journal of the American Ceramic Society; (USA) Vol. 72; ISSN JACTA; ISSN 0002-7820
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BARIUM CARBONATES
BARIUM COMPOUNDS
BARIUM OXIDES
CALCINATION
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DECOMPOSITION
DIELECTRIC PROPERTIES
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
ELEMENTS
FABRICATION
GRAIN BOUNDARIES
HOLLANDITE
IMPURITIES
MICROSCOPY
MICROSTRUCTURE
MINERALS
NONMETALS
OXIDE MINERALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
POWDERS
PYROLYSIS
SINTERING
SYNTHESIS
THERMOCHEMICAL PROCESSES
TITANATES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY