Premium
Enhanced Field‐Induced Strain in the Textured Lead‐Free Ceramic
Author(s) -
Zhao Yongjie,
Zhang Xiaowen,
Huang Rongxia,
Chen Kepi,
Wang Hui,
Jin Haibo,
Zhou Heping
Publication year - 2016
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/jace.14429
Subject(s) - piezoelectricity , ceramic , materials science , sintering , dipole , electromechanical coupling coefficient , doping , composite material , field (mathematics) , condensed matter physics , mineralogy , optoelectronics , chemistry , mathematics , physics , organic chemistry , pure mathematics
Reactive template grain growth method was applied to prepare <001> grain oriented 0.94(Na 0.52 K 0.48 )NbO 3 –0.06LiNbO 3 ceramics using plate‐like NaNbO 3 particles as template. A two‐step sintering procedure was put forward to obtain textured ceramics with electromechanical coupling factor k p = 64%, piezoelectric constant d 33 = 220 pC/N, and in practical application the value of available d 33 ∗ (converse piezoelectric constant) is about 516 pm/V, which are much higher than these of random form with same composition. Based on the analysis for the behavior of piezoelectricity against the measuring frequency and the intensity of external field, a possible mechanism considering the interaction between defect dipoles induced by the doping of Cu 2+ and spontaneous polarization dipoles was proposed to elucidate the field‐induced giant strain in textured ceramics. This study does not only provide an insight to the origin and coupling effect of two kinds of dipole but also renders a general approach of defect engineering to take advantage of point defect in ceramics realizing certain function enhancement.