Texture Engineering of Lead-Free Piezoelectric Ceramics

Reference Presenter Authors
08-085 Jae-Ho Jeon Jeon, J.(Korea Institute of Materials Science); Cha, H.(Korea Institute of Materials Science); Lead-free ceramics have been receiving especial attentions as promising piezoelectric materials to replace Pb(Zr,Ti)O3 (PZT)-based piezoelectric ceramics. Although Bi0.5(Na,K)0.5TiO3 (BNKT)- and (K,Na)NbO3 (KNN)-based ceramics are reported to be promising for piezoelectric applications, their piezoelectric properties must be further improved before they can replace PZT. The piezoelectric properties of BNKT- and KNN-based ceramics can be improved through compositional modification by preparing solid solutions. Further improvement in the piezoelectric properties can be achieved by controlling the grain orientation through texture engineering using anisotropic templates with plate-like shapes. Through the growth of aligned templates, texture engineering can produce samples containing grains aligned along certain crystallographic orientations instead of randomly distributed matrix grains. One of the most important parameters in texture engineering is the role of the template. Plate-like Bi4.5Na0.5Ti4O15 (BNT15) (or Bi0.5Na0.5TiO3) and NaNbO3 (NN) are generally used as templates for texturing of BNKT and KNN ceramics, respectively. These templates are prepared by the molten-salt method followed by the topochemical microcrystal conversion (TMC) process. In this study, we investigated the role and behavior of templates in texture engineering of BNKT- and KNN-based lead-free piezoelectric ceramics.
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