Electrical and Physical Properties of Modified Potassium Sodium Niobate Ceramics Prepared by Molten Salt Synthesis

摘要

In the present work, molten salt method was applied to synthesize the 0.9875(K_(0.5)Na_(0.5))NbO_3-0.0125BiScO_3 (KNN-BS) powders. Pure phase of KNN-BS powder was obtained for a calcination temperature of 700°C which lower than a conventional mixed oxide method by 250°C. The KNN-BS ceramics were fabricated by a solid-state reaction technique. Effects of excess Na and K on the properties of the ceramics were investigated. The excess Na and K produced an increase in dielectric constant at the ferroelectric to paraelectric transition temperature as well as change the transition temperatures. Further, the ferroelectric behavior was also improved by the additives.