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In this contribution, the effect of P2O5 and SiO2 addition on the phase,microstructure, and electrical properties of KNbO3 was studied. Sample powderswith the general formula (1-x)KNbO3.xP2O5 (x = 0.03, 0.05) and (1-x)KNbO3.xSiO2(x = 0.1) were prepared via mixed-oxide route. The thermal behavior of themixed-milled powder was investigated by TG/DTA which revealed an overall weightloss of 33.4 wt % in the temperature range of 30 < T < 1200 C andcrystallization exotherm occurring at about 795 C. The present resultsindicated that P2O5 acted as a sintering aid and lowered the sinteringtemperature by about 30 C and promoted densification of KNbO3. Samplecompositions at various stages of processing were characterized using X-raydiffraction. Samples sintered at T < 1020 C revealed mainly KNbO3 together witha couple of low-intensity K3NbO4 peaks as a secondary phase. The SEM images of(1-x)KNbO3.xSiO2 (x = 0.1) samples showed a slight increase in the averagegrain size from 3.76 um to 3.86 um with an increase in sintering temperaturefrom 1000 C to 1020 C. Strong variations in dielectric constant and losstangent were observed due to P2O5 and SiO2 addition as well as frequency of theapplied AC signals.

Influence of P2O5 and SiO2 addition on the phase, microstructure, and electrical properties of KNbO3