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Phase Characteristics and Piezoelectric Properties in the Bi 0.5 Na 0.5 TiO 3 –BaTiO 3 –K 0.5 Na 0.5 NbO 3 System
Author(s) -
Zhang ShanTao,
Wang Lei,
Chen YanFeng,
Kounga Alain Brice
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03592.x
Subject(s) - phase boundary , piezoelectricity , materials science , tetragonal crystal system , ferroelectricity , natural bond orbital , phase (matter) , piezoelectric coefficient , mineralogy , analytical chemistry (journal) , condensed matter physics , crystallography , dielectric , crystal structure , chemistry , composite material , physics , optoelectronics , density functional theory , computational chemistry , organic chemistry , chromatography
Lead‐free 0.94Bi 0.5 Na 0.5 TiO 3 –(0.06− x )BaTiO 3 – x K 0.5 Na 0.5 NbO 3 ( x =0–0.06) ceramics were prepared. All these compositions have a structure close to the rhombohedral–tetragonal morphotropic phase boundary (MPB) and good electric properties at room temperature. No significant composition dependence of ferroelectric property can be established, whereas a dependence of piezoelectric properties can be observed, e.g. the piezoelectric coefficient ( d 33 ), planar coupling factor ( k p ), and field‐induced strain ( S ) increase with increasing x when x ≤0.01 and then tend to decrease. The highest d 33 , k p , and bipolar strain are 118 pC/N, 0.29, and 0.32%, respectively, in the composition with x =0.01. The results not only indicate that BNT–BT–KNN lead‐free piezoceramics can persist in the structure close to MPB in a wide composition range but that they may also be helpful for further investigation on lead‐free piezoceramics.