Abstract
In this paper, highly pure Na0.5K0.5NbO3 nanopowder was prepared from an economical sol–gel method. Using the nanopowder, dense Na0.5K0.5NbO3 ceramics with ultrafine grain sizes in the range of 200–600 nm were fabricated successfully by low-temperature solid-state sintering at 1085°C for 4 h. The ultrafine-grained ceramics exhibited fine ferroelectric, piezoelectric, and dielectric characteristics. Its room temperature d33, Kp, ɛ33T/ɛ0 at 1 kHz, tan δ and relative density are 154 pC/N, 30.5%, 407%, 0.0155%, and 96.8%, respectively. The results indicate that it is considerably potential to synthesize ultrafine-grained doped potassium-sodium niobate ceramics with excellent properties by using of nanopowder prepared from the sol–gel method.
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