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Effects of Sintering Atmosphere on Piezoelectric Properties of 0.75BF-0.25BT Ceramic
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 Title & Authors
Effects of Sintering Atmosphere on Piezoelectric Properties of 0.75BF-0.25BT Ceramic
Kim, Dae Su; Kim, Jeong Seog; Cheon, Chae Il;
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 Abstract
0.75BF-0.25BT ceramics were prepared by sintering at in air or under atmosphere powder. A sample with 1 mole %-excess was also prepared to compensate for -evaporation. Physical and piezoelectric properties of these three samples were compared. When the sintering temperature increased from to , the density of the sample sintered in air decreased continuously due to Bi-evaporation. Due to the suppression of Bi-evaporation, the sample sintered under atmosphere powder had a higher density at sintering temperatures above than did the sample sintered in air. The addition of 1 mole %-excess successfully compensated for Bi-evaporation and kept the density at the higher value until . Grain size increased continuously when the sintering temperature increased from 980 to , irrespective of the sintering atmosphere. When the sintering temperature increased, the piezoelectric constant () and the electromechanical coupling factor () increased for all samples. The sample with 1 mole % excess- showed the highest density and the best piezoelectric properties at sintering temperature of .
 Keywords
;Sintering;Excess-;Piezoelectricity;
 Language
English
 Cited by
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