Abstract
The crystal structure of (1-x) (Na0.5 K0.5) NbO3 -x CaTiO3 ceramics began to change from orthorhombic to tetragonal at x0.03, then became a morphotropic phase boundary in which both the orthogonal and tetragonal phases coexisted at 0.03<x<0.07, and was converted to tetragonal structure at x0.07. The Curie temperature decreased with increasing x and the specimen became a relaxor at x0.03. A dense microstructure with large grains was developed at 0.04<x<0.07 due to liquid phase sintering. The relative density, grain size, and liquid phase considerably influenced the piezoelectric properties of the specimens. High piezoelectric properties of d33 =241, kp =0.41, and ε3T / εo =1316 were obtained from the 0.95NKN-0.05CT ceramics sintered at 1050 °C for 2 h, indicating that the 0.95NKN-0.05 ceramic is a good candidate material for lead-free piezoelectric ceramics.
Original language | English |
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Article number | 124101 |
Journal | Journal of Applied Physics |
Volume | 102 |
Issue number | 12 |
DOIs | |
Publication status | Published - 2007 |
Bibliographical note
Funding Information:This work was supported financially by the Medium Term Strategic Technology Development Program of the Korea Ministry of Commerce, Industry and Energy (No. 10028449-2006-11).
ASJC Scopus subject areas
- Physics and Astronomy(all)