N S Panwar
Articles written in Bulletin of Materials Science
Volume 26 Issue 6 October 2003 pp 619-625 Ferroelectrics
Pellets of ceramic, Na1–𝑥K𝑥NbO3 (𝑥 = 0, 0.2 and 0.5), were prepared by conventional solid-state reaction method. Prepared samples were characterized using XRD and SEM. The frequency and temperature variation of dielectric constant, loss tangent and dielectric conductivity of prepared samples were measured in the frequency range from 10 KHz–1 MHz, and in the temperature range from 50–250°C for 𝑥 = 0.2 and 0.5,and between 50 and 480°C for 𝑥 = 0 compositions. It was observed that the dielectric constant and loss tangent decrease, and conductivity increases with increasing frequency. Near the transition temperature the material shows anomalous behaviour for the observed properties, and the peaks of dielectric constant and loss tangent were observed shifting towards lower temperature with increasing frequency.
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