期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 658, 期 -, 页码 839-847出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.10.245
关键词
(Na0.5K0.5)(1-x)LixNbO3; Piezoelectric ceramic; Crystal structure; Morphtropic phase boundary; Atmosphere treatment; AC conduction
资金
- National Natural Science Foundation [51502346, 51172187, 51306207]
- SRPDF of MOE [20116102130002, 20116102120016]
- 111 Program of MOE [B08040]
- Xi'an Science and Technology Foundation [XBCL-1-08, CX12174]
- Shaanxi Province Science Foundation [2013KW12-02]
- SKLP Foundation [KP201421]
- Fundamental Research Funds for the Central Universities of China [3102014JGY01004]
Crystal structures and electrical properties of (Na0.5K0.5)(1-x)LixNbO3 (x = 0, 0.055, 0.06, 0.065, 0.07; KNN-xLi) ceramics were investigated systematically. Rietveld refinements confirmed that the ceramic with x = 0.06 modification had a typical morphtropic phase boundary (MPB) structure, where the proportions of orthorhombic (Amm2) and tetragonal (P4mm) phases were 58.37% and 41.63%, respectively. However, tetragonal phase structure was predominant in the x = 0.07 ceramic with 75.57% P4mm phase. Piezoelectric ceramics KNN-xLi were post-annealed in nitrogen (N-2) and oxygen (O-2), and atmosphere had a strong impact on the electrical properties of them. O-2 treatment resulted in improvements in ferroelectric polarization, electrostriction characteristic and piezoelectric property, due to the decrease in oxygen vacancy concentration. On the contrary, a deteriorated performance was found in the N-2-treated samples. Impedance data of KNN-xLi ceramics were largely dominated by the sample bulk, and variable-atmosphere experiments suggested that the KNN-0.06Li ceramic was mainly n-type material. The O-2-treated KNN-0.06Li ceramic with a T-c of 473 degrees C had a remnant polarization (P-r) of 29.2 mu C/cm(2), a field-induced strain (S-33) of 0.152%, a piezoelectric coefficient (d(33)) of 218 pC/N and an electromechanical coupling factor (k(p)) of 43%. (C) 2015 Published by Elsevier B.V.
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