Abstract
Ferroelectric solid solutions usually exhibit enhanced functional properties at the morphotropic phase boundary separating two ferroelectric phases with different orientations of polarization. The underlying mechanism is generally associated with polarization rotational instability and the flattened free energy profile. In this work we show that the polarization extensional instability can also be induced at the morphotropic phase boundary beyond the reported polar-nonpolar phase boundary. The piezoelectricity enhanced by this mechanism exhibits excellent thermal stability, which helps to develop high performance piezoelectric materials with good temperature stability.
Highlights
Composition driven structural instability in perovskite ferroelectricsChao Xu,[1] Qiang Li,1,a Qingfeng Yan,[1] Yiling Zhang,[2] and Xiangcheng Chu2 1Department of Chemistry, Tsinghua University, Beijing 100084, China 2State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing, 100084, China (Received 27 November 2016; accepted 19 March 2017; published online 12 April 2017)
In searching for high performance piezoelectric materials, it is essential to focus on the principal characteristics of the morphotropic phase boundary (MPB) based on a deep understanding of the driven structural instabilities.[6,7]
The polytrophic and morphotropic phase boundary driven structural instability are discussed in terms of the dielectric and piezoelectric properties
Summary
Chao Xu,[1] Qiang Li,1,a Qingfeng Yan,[1] Yiling Zhang,[2] and Xiangcheng Chu2 1Department of Chemistry, Tsinghua University, Beijing 100084, China 2State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing, 100084, China (Received 27 November 2016; accepted 19 March 2017; published online 12 April 2017)
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