title: Induced core-shell structure and the electric properties of (K0.48Na0.52)0.95Li0.05Nb0.95Sb0.05O3ceramics.
abstract: The relationship among dielectric anomaly, ferroelectric response, defects, and microstructures was established for (K0.48(1+x)Na0.52)0.95Li0.05Nb0.95Sb0.05O3(x = 0.04, 0.00, -0.02, -0.04 and -0.08) ceramics. For x = -0.02 and -0.04, larger coercive fields and lower remnant polarizations were obtained; besides, an additional dielectric relaxation behavior was observed with the activation energy Eabeing about 2.19 eV and 1.92 eV, respectively. Furthermore, the grain and grain boundary contributions to the capacitance were separated using impedance spectroscopy, which, combined with back-scattering characterization, firmly indicates the core-shell structure of K-deficient samples (x = -0.02 and -0.04). Unlike the cores, the shells possess a large amount of K+vacancies (). This work paves a way for regulating the fine structure and more on the electrical properties of KNN-based materials.
authors.affiliation: National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, People's Republic of China. xiaomeil@nju.edu.cn.
authors.forename: Min
authors.initials: M
authors.lastname: Zhou
authors.affiliation: National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, People's Republic of China. xiaomeil@nju.edu.cn and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, People's Republic of China.
authors.forename: Xiaomei
authors.identifier: http://orcid.org/0000-0002-8794-1000
authors.initials: X
authors.lastname: Lu
authors.affiliation: National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, People's Republic of China. xiaomeil@nju.edu.cn.
authors.forename: Dianyuan
authors.initials: D
authors.lastname: Yang
authors.affiliation: National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, People's Republic of China. xiaomeil@nju.edu.cn.
authors.forename: Ju
authors.initials: J
authors.lastname: He
authors.affiliation: National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, People's Republic of China. xiaomeil@nju.edu.cn and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, People's Republic of China.
authors.forename: Fengzhen
authors.initials: F
authors.lastname: Huang
authors.affiliation: National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, People's Republic of China. xiaomeil@nju.edu.cn.
authors.forename: Fang
authors.initials: F
authors.lastname: Mei
authors.affiliation: National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, People's Republic of China. xiaomeil@nju.edu.cn.
authors.forename: Xianming
authors.initials: X
authors.lastname: Ren
authors.affiliation: National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, People's Republic of China. xiaomeil@nju.edu.cn.
authors.forename: Xingyu
authors.initials: X
authors.lastname: Xu
authors.affiliation: National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, People's Republic of China. xiaomeil@nju.edu.cn.
authors.forename: Yang
authors.initials: Y
authors.lastname: Li
authors.affiliation: National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, People's Republic of China. xiaomeil@nju.edu.cn and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, People's Republic of China.
authors.forename: Jinsong
authors.initials: J
authors.lastname: Zhu