Contribution of Bi0.5Na0.5ZrO3 on phase boundary and piezoelectricity in K0.48Na0.52Nb0.96Sb0.04O3-Bi0.5Na0.5SnO3-xBi(0.5)Na(0.5)ZrO(3) ternary ceramics

摘要

In this work, we have attained a large piezoelectricity (d(33) similar to 468 pC N-1) in (0.9925-x) K0.48Na0.52Nb0.96Sb0.04O3-0.0075Bi(0.5)Na(0.5)SnO(3)-xBi(0.5)Na(0.5)ZrO(3) (abbreviation: KNNS-BNS-xBNZ) ternary ceramics, prepared by a conventional solid-state reaction method. We illuminated the role of BNZ on the phase boundary and piezoelectric properties of the ceramics. Rhombohedra-orthorhombic-tetragonal (R-O-T) phase coexistence can be developed by controlling BNZ content, and then a high d(33) value of similar to 468 pC N-1 can be attained in the ceramics with x = 0.03. This result indicates that a higher d(33) value can be attained by forming a new phase boundary using the addition of BNZ with respect to those of 0.9925K(0.48)Na(0.52)Nb(0.96)Sb(0.04)O(3)-0.0075Bi(0.5)Na(0.5)SnO(3) ceramics with an orthorhombic phase. In addition, the maximum value both strain and d(33)* are all obtained at x = 0.04 (strain similar to 0.18% and d(33)* similar to 440 pm/V), which means that optimum BNZ content can enhance the strain and d(33)* of the ceramics. As a result, the ternary ceramic system may become one of the most promising candidates for the practical applications of KNN-based materials. (C) 2016 Elsevier B.V. All rights reserved.