Ferroelectric NaNbO3 Ceramics Fabricated by Spark Plasma Sintering

概要

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High-density ceramic samples of NaNbO3 (NN) have been successfully fabricated by spark plasma sintering (SPS), which is a process that uses microscopic electrical discharge between particles under pressure. The obtained NN ceramic shows a hysteresis loop characteristic of ferroelectrics. The coercive electric field, $E_{\text{c}}$, and remanent polarization, $P_{\text{r}}$, are determined to be 12 kV/cm and 0.42 μC/cm2, respectively, for an unpoled sample and 16 kV/cm and 27 μC/cm2, respectively, for a poled sample. The NN ceramic also shows piezoelectricity with a planar electromechanical coupling factor, $K_{\text{p}}$, of about 20%. The ferroelectricity and piezoelectricity in the NN ceramic are stable at high temperatures. The piezoelectric characteristic does not change after annealing at 300°C but it disappears after annealing at 350°C.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2003-09-15