Investigation on transition behavior and electrical properties of (K0.5Na0.5)1-xLixNb0.84Ta0.1Sb0.06O3 around polymorphic phase transition region
Chen Zhu,
Wenchao Wang,
Jiquan Huang,
Fei Tang,
Yang Liu,
Honglin Shi,
Fangyu Wang,
Chong Wang,
Yongge Cao,
Xuanyi Yuan
Affiliations
Chen Zhu
Department of Physics, Renmin University of China, Beijing 100872, P R China
Wenchao Wang
Department of Physics, Renmin University of China, Beijing 100872, P R China
Jiquan Huang
Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, PR China
Fei Tang
Department of Physics, Renmin University of China, Beijing 100872, P R China
Yang Liu
School of Chemistry and Environment Engineering, Shaoguan University, Shaoguan 512005, PR China
Honglin Shi
Department of Physics, Renmin University of China, Beijing 100872, P R China
Fangyu Wang
Department of Physics, Renmin University of China, Beijing 100872, P R China
Chong Wang
Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, PR China
Yongge Cao
Department of Physics, Renmin University of China, Beijing 100872, P R China
Xuanyi Yuan
Department of Physics, Renmin University of China, Beijing 100872, P R China
(K0.5Na0.5)1-xLixNb0.84Ta0.1Sb0.06O3 (KNLNTS) lead free ceramics with different Li concentration were fabricated by conventional solid-state reaction method. By increasing Li ions in KNLNTS, the grains grow up and the crystal structure changes from orthorhombic to tetragonal. When 0.03 ≤ x ≤ 0.05, the ceramics structure lays in PPT region. Polarization versus electric field (P-E) hysteresis loops at room temperature show good ferroelectric properties and the remnant polarization decreases by increasing Li content while coercive electric keeps almost unchanged. In PPT region, taking x = 0.04 as an example, the sample shows excellent dielectric properties: the dielectric constant is 1159 and loss tangent is 0.04, while the piezoelectric constant d33 is 245 pC/N and kp is 0.44 at room temperature, it is promising for (K0.5Na0.5)1-xLixNb0.84Ta0.1Sb0.06O3 with 4 at. % Li to substitute PZT.
