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Induced core-shell structure and the electric properties of (K0.48Na0.52)0.95Li0.05Nb0.95Sb0.05O3 ceramics.
Zhou, Min; Lu, Xiaomei; Yang, Dianyuan; He, Ju; Huang, Fengzhen; Mei, Fang; Ren, Xianming; Xu, Xingyu; Li, Yang; Zhu, Jinsong.
Afiliação
  • Zhou M; National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, People's Republic of China. xiaomeil@nju.edu.cn.
  • Lu X; 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.
  • Yang D; National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, People's Republic of China. xiaomeil@nju.edu.cn.
  • He J; National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, People's Republic of China. xiaomeil@nju.edu.cn.
  • Huang F; 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.
  • Mei F; National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, People's Republic of China. xiaomeil@nju.edu.cn.
  • Ren X; National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, People's Republic of China. xiaomeil@nju.edu.cn.
  • Xu X; National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, People's Republic of China. xiaomeil@nju.edu.cn.
  • Li Y; National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, People's Republic of China. xiaomeil@nju.edu.cn.
  • Zhu J; 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.
Phys Chem Chem Phys ; 19(3): 1868-1874, 2017 Jan 18.
Article em En | MEDLINE | ID: mdl-28000815
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 Ea being 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.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2017 Tipo de documento: Article