Abstract
The loss of piezoelectricity in ferroelectric sodium bismuth titanate (NBT) in solid solution with barium titanate ((1−x)NBT−xBT) is studied by means of thermal depoling and Raman spectroscopy. In the range 0≤x≤13%, the highest thermal stability of the piezoelectric coefficients is found in x=13%, for which a longitudinal piezoelectric coefficient of 118pC/N was nearly temperature-independent up to a maximum temperature of 165°C. The composition nearest the morphotropic phase boundary, x=6%, exhibited the lowest thermal depoling temperature of 107°C. Depoling of this composition is suggested to arise from a second order phase transition evidenced in the temperature-dependent Raman spectra.
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