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- Title
Effects of Na/K ratio on the phase structure and electrical properties of Na<sub> x</sub>K<sub>1− x</sub>NbO<sub>3</sub> lead-free piezoelectric ceramics.
- Authors
Zhang, Qian; Zhang, Boping; Li, Haitao; Shang, Pengpeng
- Abstract
Lead-free piezoelectric Na xK1− xNbO3 ( x = 0.3–0.8) (NKN) ceramics were fabricated by normal sintering at 1060°C for 2 h. Microstructures and electrical properties of the ceramics were investigated with a special emphasis on the influence of Na content. The grain size of the produced dense ceramic was decreased by increasing Na content. A discontinuous change in the space distance was found at the composition close to Na0.7K0.3NbO3 ceramic, which indicates the presence of a transitional composition between two different orthorhombic phases, which is similar to the behavior of morphotropic phase boundary (MPB) in Na xK1− xNbO3 ceramics. Such MPB-like behavior contributes to the enhanced piezoelectric coefficient d33 of 122 pC/N, planar-mode electromechanical coupling coefficient kP of 28.6%, and dielectric constant ɛr of 703, respectively for the Na0.7K0.3NbO3 ceramic. Cubic temperature TC and the transitional temperature TO-T from orthorhombic to tetragonal phase are observed at around 420°C and 200°C, respectively.
- Publication
Rare Metals, 2010, Vol 29, Issue 2, p220
- ISSN
1001-0521
- Publication type
Article
- DOI
10.1007/s12598-010-0038-y