Effect of K2CO3 additive on crystallinity and piezoelectric properties of KNNS-BZ-BKH ceramics
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In this study, the piezoelectric ceramics, (0.955) K0.48Na0.52Nb0.9Sb0.1O3-(0.025) BaZrO3-(0.02) Bi0.5K0.5HfO3 (KNNS-BZ-BKH)with m mol% K2CO3 additives in the range of m = 0.0 to 3.96 have been successfully fabricated using the solid-state reactionmethod. The effect of K2CO3 on the sintering behavior, structure, microstructure, and electrical properties of KNNS-BZ-BKHceramics was investigated. The experimental results showed that the addition of K2CO3 improved the sintering process ofKNNS-BZ-BKH, which exhibited a well-sintered ceramic with a dense and pure perovskite structure stoichiometrically. At anoptimal sintering temperature of 1210 oC and K2CO3 content of 2.64 mol%, enhanced physical properties of the ceramics suchas density 4.0 g cm3 and piezoelectric constant d33 = 75 pC/N were obtained through enhancement of KNNS-BZ-BKHmicrostructures with the best results exhibiting a pure perovskite phase with no secondary phases due to crystallinityimprovement.
Abstract
In this study, the piezoelectric ceramics, (0.955) K0.48Na0.52Nb0.9Sb0.1O3-(0.025) BaZrO3-(0.02) Bi0.5K0.5HfO3 (KNNS-BZ-BKH)with m mol% K2CO3 additives in the range of m = 0.0 to 3.96 have been successfully fabricated using the solid-state reactionmethod. The effect of K2CO3 on the sintering behavior, structure, microstructure, and electrical properties of KNNS-BZ-BKHceramics was investigated. The experimental results showed that the addition of K2CO3 improved the sintering process ofKNNS-BZ-BKH, which exhibited a well-sintered ceramic with a dense and pure perovskite structure stoichiometrically. At anoptimal sintering temperature of 1210 oC and K2CO3 content of 2.64 mol%, enhanced physical properties of the ceramics suchas density 4.0 g cm3 and piezoelectric constant d33 = 75 pC/N were obtained through enhancement of KNNS-BZ-BKHmicrostructures with the best results exhibiting a pure perovskite phase with no secondary phases due to crystallinityimprovement.
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