Abstract
Hydrostatic piezoelectric strain coefficients dh (∼10 pC/N) and voltage coefficients gh (80–100×10-3 V m/N) on single crystals of Ba2TiSi2O8, Ba2TiGe2O8 have been measured as a function of temperature, pressure, and frequency. The values are found to be comparable to those of the state of the art piezoelectric PVDF polymers. Measurements are also made on the glass-ceramics in the compositions of BaO–TiO2–SiO2 and some isostructural materials compositions in the system BaO–TiO2–GeO2. The typical values of the piezoelectric constants of glass ceramics are almost on the order of those obtained on the respective single crystal samples. Glass-ceramics provide a promising way of achieving the larger area samples needed for various piezoelectric devices.