Influence of Sintering Conditions on Electric Performance of Textured 92BNT-6BT-2KNN Ceramics

Abstract:

0.92(Bi0.5Na0.5)TiO3-0.06BaTiO3-0.02(K0.5Na0.5)NbO3(92BNT-6BT-2KNN) is a high-stain material due to the volume change which come from antiferroelectric-ferroelectric (AFE-FE) phase transformation. Textured 92BNT-6BT-2KNN with a Lotgering factor of 67% was obtained by templated grain growth (TGG) method using plate-like (Bi0.5Na0.5)TiO3（BNT）particles as templates. The influences of sintering process on Lotgering factor and strain were investigated. It was found that the Lotgering factor increased as sintering temperature increase and then decreased with further temperature increase. The changing tendency of polar and unipolar strain did not keep the same accordance with that of Lotgering factor. The maximum of Lotgering factor (79%) and polar strain (0.36%) was obtained when the sintering temperature was 1240°C and 1220°C, respectively, due to the decrease of density when high sintering temperature was employed. Also it was found that the lotgering factor and polar strain reached its highest values when the soaking time was 4h. All these proved that the density and grain orientation codetermined the strain of 92BNT-6BT-2KNN ceramics.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 1380-1384
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.1380
• Online since: June 2012
• Authors: Cheng Gen Ye, Fang Fu, Bo Shen, Ji Wei Zhai
• Keywords: Electrostrictive Strain, Lead-Free Ceramics, Textured Ceramic

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