Title :
Preparation of dense ultra-fine grain barium titanate-based ceramics
Author :
Kumar, U. ; Wang, S.F. ; Dougherty, J.P.
Author_Institution :
Pennsylvania State Univ., University Park, PA, USA
fDate :
30 Aug-2 Sep 1992
Abstract :
Hydrothermal BaTiO3 with 3-5 wt.% Bi2O3 was sintered to very high densities at 850°C. New results on the effect of lower concentrations of Bi2O3 on the densification and the dielectric properties of the BaTiO3 ceramic are discussed in the present work. As an expansion of the previous work, hydrothermal Sr0.2Ba0.8TiO3 was sintered with 0-5 wt.% Bi2O3 between 850 and 1250°C. When 5 wt.% Bi2O3 was added, the powder compacts sintered to a bulk density of greater than 5.2 gm/cm 3, at 950°C. The room-temperature dielectric constant of this ceramic was 1500, and the K vs. T plot followed the Z5U industrial specification
Keywords :
X-ray diffraction examination of materials; barium compounds; ceramics; densification; grain growth; grain size; permittivity; powder technology; sintering; strontium compounds; 850 to 1250 degC; BaTiO3 ceramic; BaTiO3-Bi2O3; Bi2O3; Sr0.5Ba0.8TiO3-Bi2O 3; bulk density; concentrations; densification; dielectric properties; hydrothermal Sr0.2Ba0.8TiO3; powder compacts; room-temperature dielectric constant; Barium; Bismuth; Ceramics; Dielectrics; Grain size; Microstructure; Powders; Temperature; Titanium compounds; X-ray scattering;
Conference_Titel :
Applications of Ferroelectrics, 1992. ISAF '92., Proceedings of the Eighth IEEE International Symposium on
Conference_Location :
Greenville, SC
Print_ISBN :
0-7803-0465-9
DOI :
10.1109/ISAF.1992.300626
