Enhanced Piezoelectric Properties of Tetragonal (Bi1/2K1/2)TiO3 Lead-Free Ceramics by Substitution of Pure Bi-Based Bi(Mg2/3Nb1/3)O3
作者： Zhao Pan , Qi Wang , Jun Chen , Chuang Liu , Longlong Fan
DOI: 10.1111/JACE.13255
关键词: Curie temperature 、 Piezoelectricity 、 Condensed matter physics 、 Crystal structure 、 Coercivity 、 Tetragonal crystal system 、 Dielectric 、 Ceramic 、 Mineralogy 、 Materials science 、 Phase boundary
摘要: Crystal structure, piezoelectric, and dielectric properties were investigated in the new lead-free BKT-based piezoelectric ceramics of (1−x)(Bi1/2K1/2)TiO3-xBi(Mg2/3Nb1/3)O3. The morphotropic phase boundary (MPB) system between tetragonal rhombohedral phases lies near composition x = 0.02. optimal property small-signal d33 is much enhanced to be 96 pC/N (x = 0.01), which higher than any other compositions. By introduction Bi(Mg2/3Nb1/3)O3, exhibit a lower coercive field EC. In addition, relaxor-like behavior with frequency-dependent Curie temperature Tm observed, high around 380°C obtained system. This study suggests that BKT can significantly improved by means Bi(Mg2/3Nb1/3)O3 substitution.
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