Journal
CERAMICS INTERNATIONAL
Volume 43, Issue 1, Pages 634-640Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.09.207
Keywords
Piezoelectric properties; Dielectric properties; Niobates; Perovskites; Lead-free ceramics
Categories
Funding
- Special Fund Project of Southwest University [XDJK2014C111]
- 121 Key Engineering Project of Chongqing Municipality [cstc2014fazktjcsf50015]
- Science & Technology Projects of Chongqing Municipality [cstc2012ggys0001, cstc2014jcyjys0001, cstc2015jcyjys0007]
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Lead-free piezoelectric ceramics based on the perovskite solid solution 0.995(K0.5Na0.5)(1-x)LixNbO3-005BiAlO(3) were prepared using conventional solid-state sintering techniques. According to the analysis of X-ray diffraction patterns, a pure perovskite phase structure could be achieved in the studied composition range of 0 <= x <= 0.08. As the lithium content increased, the crystal structure gradually transitioned from orthorhombic to tetragonal symmetry. Furthermore, an orthorhombic tetragonal phase boundary could be observed in ceramics with the compositions of 0.03 <= x <= 0.05. The ceramics with compositions close to the orthorhombic tetragonal phase boundary exhibited enhanced piezoelectric activity, possessing the largest values of piezoelectric constant d(33), and planar and thickness electromechanical coupling coefficients, of 182 pC/N, 0.375, and 0.460, respectively. Additionally, it was found that these ceramics with excellent piezoelectric properties also possessed a high Curie temperature (similar to 450 degrees C), indicating that they would be suitable for application in elevated temperature piezoelectric devices.
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