NaNbO_3 + MeNb_2O_6系(Me=Ba, Sr, Ca)セラミックスにおける組成と圧電特性の関係
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The present paper deals with of the investigation of piezoelectric properties of xNaNbO<SUB>3</SUB>+(1-x)MeNb<SUB>2</SUB>O<SUB>6</SUB> (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 Me<SUB>2</SUB>NaNb<SUB>5</SUB>O<SUB>15</SUB>, at x=0.4-0.9 it was observed to be double phases of Me<SUB>2</SUB>NaNb<SUB>5</SUB>O<SUB>15</SUB> and NaNbO<SUB>3</SUB>, and at x≥0.95 it had single phase of NaNbO<SUB>3</SUB>. Hysteresis measurements showed that the phase of NaNbO<SUB>3</SUB> was anti-ferroelectric at x=0.4-0.8 and ferroelectric at x≥0.90. 0.05NaNbO<SUB>3</SUB>+0.95(Ba<SUB>0.4</SUB>Sr<SUB>0.4</SUB>Ca<SUB>0.2</SUB>)Nb<SUB>2</SUB>O<SUB>6</SUB> ceramics had εr=125 and θmax=86.7° (θmax is maximum phase angle between resonance point and antiresonance point). It was found that xNaNbO<SUB>3</SUB>+(1-x)(Ba<SUB>0.4</SUB>Sr<SUB>0.4</SUB>Ca<SUB>0.2</SUB>)Nb<SUB>2</SUB>O<SUB>6</SUB> ceramics had possibility of the application for resonators.
- 社団法人 粉体粉末冶金協会の論文
- 2003-05-15
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