An excellent piezoelectric charge coefficient (d33 = 450 pCN1) was obtained in lead-free Na0.47K0.47Li0.06NbO3 ceramic by optimized sintering
temperature with uniform and dense grains. It showed orthorhombic to tetragonal polymorphic phase transition at 24 oC and a high Curie temperature
(470 oC). It also exhibited good, fatigue-free ferroelectric properties and a high pyroelectric coefficient (1106.1 lCm2 oC1). Thus,
K0.5Na0.5NbO3-based ceramics with uniform grains are good candidates of piezo-/ferroelectric applications.
2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.