Abstract
The influence of the electric field on a dielectric constant was studied by the dielectric spectroscopy in PMN 1 − x PT x single crystal with x = 0.295. It is shown that the complex dielectric constant exhibits significant dependence on the bias electric field in the vicinity of the liquid-vapor type critical point. With increasing field and on approaching the critical point the dielectric constant exhibits enhancement and after crossing the critical field value both dielectric constant and loss factor decrease significantly. These results show that the proximity of the critical point may also play an important role in engineering of the electric-field tunable microwave elements.
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