Abstract
Abstract The frequency response of the dielectric constant (∊r), dielectric loss (tanδ) and impedance (Z) of Potassium acid pthalate (KAP) single crystals, monitored along the polar axis, is characterised by the presence of strong mechanical resonances, in the 50-200 kHz region. The observed resonance behaviour, which is dependent on the geometric size of the sample, is attributed to the piezoelectric nature of the sample. Studies on the effect of variation of temperature and pressure, on the stiffness coefficient (C), indicate that C increases with increasing pressure and decreasing temperature. The electro-mechanical coupling coefficient (k) has been evaluated based on the resonance-antiresonance method and its dependence on temperature and pressure has been studied.
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