Unique single-domain state in a polycrystalline ferroelectric ceramic
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In this paper, a single-domain state in a BaTiO-based polycrystalline ceramic at intermediate poling electric fields with in situ transmission electron microscopy was observed.Abstract:
Non-180\ifmmode^\circ\else\textdegree\fi{} ferroelectric domains are also ferroelastic domains; their existence in polycrystalline materials is to relieve internal stresses generated during solid-solid phase transitions and minimize the elastic distortion energy. Therefore, grains with random orientations in polycrystalline ceramics are always occupied by many domains, especially in the regions close to grain boundaries. In this Rapid Communication, we report the observation of a single-domain state in a BaTiO${}_{3}$-based polycrystalline ceramic at intermediate poling electric fields with in situ transmission electron microscopy. The grains in the virgin ceramic and under high poling fields are found multidomained. The unique single-domain state is believed to be responsible for the ultrahigh piezoelectric property observed in this lead-free composition and is suggested to be of orthorhombic symmetry for its exceptionally low elastic modulus.read more
Citations
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Phase transitions and the piezoelectricity around morphotropic phase boundary in Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 lead-free solid solution
Le Zhang,Ming Zhang,Liang Wang,Chao Zhou,Zhen Zhang,Yonggang Yao,Lixue Zhang,Dezhen Xue,Xiaojie Lou,Xiaobing Ren,Xiaobing Ren +10 more
TL;DR: In this article, two displacive phase transitions around the morphotropic phase boundary (MPB) in Ba(Zr0.8)O3-x(Ba0.7Ca0.2Ti0.3)TiO3 (BZT-xBCT) ceramics were detected by inspecting two anomalies of the Raman Ti4+-O2− longitudinal optical mode.
References
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The Effect of Electric Poling on the Performance of Lead‐Free (1−x)Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3 Piezoceramics
TL;DR: In this paper, the effect of increasing poling fields on the properties of (1−x) BZT-xBCT compositions across the morphotropic phase boundary (MPB) was studied using large signal polarization and strain, small signal permittivity and piezoelectric coefficient, and XRD measurements.