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Norén, Lasse
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article
Structure, dielectric and ferroelectric properties of lead free (K,Na)(Nb)O3-xBiErO3 piezoelectric ceramics
Abstract
<p>The effect of BiErO<sub>3</sub> (BE) as a doping material on the structural, dielectric and ferroelectric properties of (KNa)NbO<sub>3</sub> ceramics was explored in this research. Co-existence of two phase regions was confirmed in the composition range at x = 0.5% and x = 1.0%. The addition of BE content led to a decrease of the grain size and the ceramics became denser. Bulk P–E hysteresis loops were obtained with a maximum polarization of P<sub>max</sub> = 30.56 µC/cm<sup>2</sup> and a remnant polarization of P<sub>r</sub> = 25.10 µC/cm<sup>2</sup>, along with a coercive field of E<sub>c</sub> ~ 11.26 kV/cm. The results revealed that a field strain value of ~ 0.26 for x = 0.5% of BE substitution was attained. This presents outstanding piezoelectric and dielectric properties.</p>