Abstract
High temperatures (≥ 1100 °C) and narrow temperature window (∼ 20 °C) for sintering dense K0.5Na0.5NbO3 ceramics always deteriorate their electrical properties. Here, via cold-sintering assisted sintering method, dense K0.5Na0.5NbO3 ceramics were obtained in a wide temperature span between 800 °C and 1000 °C. An aqueous solution of NaOH and KOH mixture was used as transient liquid. Effects of liquid content (LC), molar concentration (MC) of liquid, cold-sintering temperature (TCS), and post-annealing temperature (TAN) on densification and electrical properties of the ceramics were investigated in detail. The ceramics prepared using LC = 10 wt%, MC = 10 mol/L, TCS = 350 °C, and TAN = 900 °C exhibit excellent electrical properties with d33 = 123 pC/N, εr = 609, tanδ = 0.021, Pr = 28.0 μC/cm2, Pm = 39.2 μC/cm2, and Ec = 20.3 kV/cm. Compared to the ceramics with same or similar compositions via conventional solid-state sintering, the present K0.5Na0.5NbO3 ceramics exhibit excellent electrical properties. The study endows the cold-sintering assisted sintering the successful method to prepare K0.5Na0.5NbO3 ceramics at low temperatures and in a wide temperature window.
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