Effect of sintering temperature on ferroelectric properties of 0.94(K0.5Na0.5)NbO3–0.06LNbO3 system

Lead free 0.94(K0.5Na0.5NbO3)–0.06(LiNbO3) (KNN–LN) system was synthesized by conventional solid state reaction route (CSSRR). The KNN–LN system was calcined at 850 °C for 6 h for the formation of single perovskite phase whereas the sintering was done at 1050 °C, 1080 °C and 1100 °C for 4 h, respectively. The KNN–LN samples sintered at 1080 °C show better properties: room temperature (RT) dielectric constant (ɛr) ∼936, dielectric loss (tan δ) ∼0.016 at 1 MHz, a relatively high bulk density (ρ) ∼4.385 g/cm3, which is 97.5% of the theoretical density (TD ∼ 4.51), remnant polarization (Pr) ∼6.4 μC/cm2 and coercive field (Ec) ∼9.6 kV/cm have been observed.