Grain size effects in barium titanate

Author

Gachigi, K. Wa ; Kumar, U. ; Dougherty, J.

Author_Institution

Pennsylvania State Univ., University Park, PA, USA

fYear

1992

fDate

30 Aug-2 Sep 1992

Firstpage

492

Lastpage

495

Abstract

Grain size effects in CBaTiO₃ are examined as a function of porosity in order to evaluate the effect of microstructurally imposed stresses on the dielectric behavior. Hydrothermal starting powder was used to minimize any extraneous effects. Fast firing techniques were used to obtain a variety of grain sizes and densities, and the data were evaluated using an analysis of the Curie-Weiss behavior. A percolation limit between 48% and 60% of theoretical density is proposed below which insufficient flux continuity is thought to limit the dielectric response of the ceramic. Above this limit, increased density appears to increase the room-temperature dielectric constant for grain sizes between approximately 0.6 μm and 20 μm

Keywords

barium compounds; ceramics; dielectric losses; ferroelectric Curie temperature; ferroelectric transitions; grain growth; grain size; percolation; permittivity; porosity; 0.6 to 20 micron; CBaTiO₃; Curie temperature; Curie-Weiss behavior; dielectric behavior; dielectric loss; dielectric response; firing techniques; grain density; grain growth; grain sizes; hydrothermal powder; microstructurally imposed stresses; percolation limit; porosity; room-temperature dielectric constant; Area measurement; Barium; Dielectrics; Energy measurement; Grain size; Impurities; Powders; Surface treatment; Temperature distribution; Titanium compounds;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ISAF.1992.300583

Filename

300583