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Diffused Phase Transition Boosts Thermal Stability of High‐Performance Lead‐Free Piezoelectrics
Author(s) -
Yao FangZhou,
Wang Ke,
Jo Wook,
Webber Kyle G.,
Comyn Timothy P.,
Ding JingXuan,
Xu Ben,
Cheng LiQian,
Zheng MuPeng,
Hou YuDong,
Li JingFeng
Publication year - 2016
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201504256
Subject(s) - materials science , piezoelectricity , phase transition , thermal stability , phase (matter) , tetragonal crystal system , synchrotron , atmospheric temperature range , dielectric , condensed matter physics , thermodynamics , composite material , optoelectronics , chemical engineering , optics , physics , engineering , quantum mechanics
High piezoelectricity of (K,Na)NbO 3 (KNN) lead‐free materials benefits from a polymorphic phase transition (PPT) around room temperature, but its temperature sensitivity has been a bottleneck impeding their applications. It is found that good thermal stability can be achieved in CaZrO 3 ‐modified KNN lead‐free piezoceramics, in which the normalized strain d 33 * almost keeps constant from room temperature up to 140 °C. In situ synchrotron X‐ray diffraction experiments combined with permitivity measurements disclose the occurrence of a new phase transformation under an electrical field, which extends the transition range between tetragonal and orthorhombic phases. It is revealed that such an electrically enhanced diffused PPT contributed to the boosted thermal stability of KNN‐based lead‐free piezoceramics with high piezoelectricity. The present approach based on phase engineering should also be effective in endowing other lead‐free piezoelectrics with high piezoelectricity and good temperature stability.