Properties of Ultrafine‐Grained Na 0.5 K 0.5 NbO 3 Ceramics Prepared From Nanopowder

In this paper, highly pure Na 0.5 K 0.5 NbO 3 nanopowder was prepared from an economical sol–gel method. Using the nanopowder, dense Na 0.5 K 0.5 NbO 3 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 d 33 , K p , ɛ 33 T /ɛ 0 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.