抄録
The present paper deals with of the investigation of piezoelectric properties of xNaNbO3+(1-x)MeNb2O6 (Me=Ba, Sr, Ca) ceramics. The interesting behavior of the electromechanical coupling factor (kr) for composition was found. From the XRD analysis the structure at x=0.33 appeared single phase of Me2NaNb5O15, at x=0.4-0.9 it was observed to be double phases of Me2NaNb5O15 and NaNbO3, and at x≥0.95 it had single phase of NaNbO3. Hysteresis measurements showed that the phase of NaNbO3 was anti-ferroelectric at x=0.4-0.8 and ferroelectric at x≥0.90. 0.05NaNbO3+0.95(Ba0.4Sr0.4Ca0.2)Nb2O6 ceramics had εr=125 and θmax=86.7° (θmax is maximum phase angle between resonance point and antiresonance point). It was found that xNaNbO3+(1-x)(Ba0.4Sr0.4Ca0.2)Nb2O6 ceramics had possibility of the application for resonators.
