期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 609, 期 -, 页码 60-67出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.04.024
关键词
Mg acceptor-substituted sodium potassium niobates; Double-loop-like characteristic; Defect dipoles; Defect polarization; Oxygen vacancy concentration
资金
- National Natural Science Foundation [51172187]
- SPDRF [20116102130002, 20116102, 120016]
- 111 Program of MOE [B08040]
- Xi'an Science and Technology Foundation [CX12174, XBCL-1-08]
- Shaanxi Province Science Foundation [2013KW12-02]
- NPU Fundamental Research Foundation of China [NPU-FRF-JC201232]
K0.5Na0.5Nb1 xMgxO3 (3x/2) ceramics with the Mg2+ acceptor substitution for the B-site Nb5+ were prepared by using the solid-state reaction process. K0.5Na0.5Nb0.99Mg0.01O2.985 (x = 0.01) had the most pronounced double-loop-like characteristic due to the restoring force provided by the defect polarization (P-D) associated with non-centric distributing the defect dipoles (Mg-Nb(')- V-o(..)), and the Rietveld refinement confirmed that it crystallized in the orthorhombic space group Bmm2 [a = 5.64306(7) angstrom, b = 3.94541(4) angstrom and c = 5.67406(7) angstrom] at room temperature. Furthermore, the P-E loops of K0.5Na0.5Nb0.99Mg0.01O2.985 dependence on annealing, aging, measuring frequency and measuring temperature were investigated, and the reinforcement in the double-loop-like characteristic was caused by a decrease in oxygen concentration, an increase in aging temperature, an increase in measuring frequency and a decrease in measuring temperature. (C) 2014 Elsevier B.V. All rights reserved.
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