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0.95(Na0.5K0.5)NbO3-0.05BaTiO3 + 0.2wt% Ag2O (hereafter, No excess NKN) ceramics and 0.95(Na0.5K0.5)NbO3-0.05BaTiO3 + 0.2wt% Ag2O with excess (Na0.5K0.5)NbO3 (hereafter, Excess NKN) were fabricated by the conventionalsolid state sintering method, and their phase transition properties and dielectric properties were investigated. Thecrystalline structure of No excess NKN ceramics and Excess NKN ceramics were shown characteristics of polymorphicphase transition (hereafter, PPT), especially shift from the orthorhombic to tetragonal phase by increasing sinteringtemperature range from 1,100℃ to 1,200℃. Also, the temperature coefficient of capacitance (hereafter, TCC) ofNo excess NKN ceramics and Excess NKN ceramics from -40℃ to 100℃ was measured to evaluate temperaturestability for applications in cold regions. The TCC of No excess NKN and Excess NKN ceramics showed positive TCCcharacteristics at a temperature range from -40℃ to 100℃. Especially, Excess NKN showed a smaller TCC gradientthan those of Excess NKN ceramics in range from -40℃ to 100℃. Therefore, NKN piezoelectric ceramics combinedwith temperature compensated capacitor having negative temperature characteristics is desired for usage in coldregions

Polymorphic Phase Transition and Temperature Coefficient of Capacitance of Alkaline Niobate Based Ceramics