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

Abstract

In the present work, molten salt method was applied to synthesize the 0.9875(K_0.5Na_0.5)NbO₃–0.0125BiScO₃(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.

Keywords:

• Molten salt
• transition temperature
• ferroelectric property

Acknowledgments

The authors would like to thank the Thailand Research Fund (TRF) and Office of the Higher Education Commission (OHEC) Thailand for financial supported. Thank also to Faculty of Science and Graduate School Chiang Mai University, and Faculty of Science and Technology Chiang Mai Rajabhat University for supporting facilities.