Phase coexistence induced strong piezoelectricity in K0.5Na0.5NbO3-based lead-free ceramics.
作者： Yang Yang , Hua Wang , Yao Li , Qiaoji Zheng , Jie Liao
DOI: 10.1039/C9DT01735F
关键词: Phase boundary 、 Transition temperature 、 Piezoelectricity 、 Orthorhombic crystal system 、 Condensed matter physics 、 Perovskite (structure) 、 Phase (matter) 、 Materials science 、 Ferroelectricity 、 Ceramic
摘要: For perovskite ceramics, the ferroelectric phase boundary plays an important role in improving piezoelectricity of materials. In this work, (1 − x)(K0.5Na0.5)NbO3 x[NaSbO3 + Bi0.5(Na0.8K0.2)0.5(Zr0.5Hf0.5)O3] lead-free ceramics with R-O-T coexistence were developed and relationship between structure was investigated detail. As x increases, transition temperature rhombohedral orthorhombic phases (TR-O) while orthorhombic–tetragonal (TO-T) decreases. When 0.04 ≤ 0.05, three (R-O-T) coexist near room ceramics. Due to highly consistent orientation dipole free energy flattening a low barrier induced by (R-O-T), excellent piezoelectric performances d33 = 452 pC N−1, kp 63% er 4414 are achieved at 0.04. Our study suggests that compared two boundaries (R-O O-T), can effectively enhance properties (K0.5Na0.5)NbO3-based
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