Dielectric and Piezoelectric Properties in the System: (1−x)[(Na0.5K0.5NbO3)0.93–(LiTaO3)0.07]–x[BiScO3]
Abstract:Solid solution formation in the system (1−x) [(Na0.5K0.5NbO3)0.93–(LiTaO3)0.07]−x[BiScO3] has been investigated for compositions, 0≤x≤0.05. The tetragonal c/a ratio decreases with increasing BiScO3 content, with a discontinuity at x=0.02, X-ray diffraction patterns appear pseudo-cubic for x>0.02. There is a 10-fold reduction in grain size between x=0.015 and x=0.02: dielectric peaks become suppressed and broadened at this point. Piezoelectric d33 charge coefficients decrease across the compositional range. Results are discussed in terms of chemical inhomogeneity and grain-size effects.
Document Type: Research Article
Affiliations: Institute for Materials Research, University of Leeds, Leeds LS2 9JT, U.K.
Publication date: 2010-03-01