Piezoelectric Properties of Ta (≤ 5 (mole)%) Doped in Na 0.685 K 0.315 NbO 3

To explore the piezoelectric potential of Ta doping on the MPB- like composition Na 0.685 K 0.315 NbO 3 , ceramic pellets of Na0 .685 K 0.315 Nb 1-y Ta y O 3 (y ≤ 0.05) were arranged by solid-state reaction method. For piezoelectric measurements, sintered pellets were electroded, in parallel capacitor configuration, with silver coating deposited by direct current (dc) magnetron sputtering of a silver target. Polarization and piezoelectric parameters were measured using a ferroelectric (PE- loop tracer) and piezo- meter (AixACCT Systems, GmbH). Composition (y) variation of remnant polarization, coercive field, converse piezoelectric coefficient (d * 33 ), and polarization current measurements were carried out in the prepared compositions. The remnant polarization ( P r) is 18.439 μC/cm2 with a coercive field ( E c) of 8 kV/cm for NKNT single crystals. d* 33 was observed 300.76 pm/V for y = 0.04 at the applied field of 22kV/cm.