BNT-ST 세라믹스의 저온 소결과 강유전 및 압전 특성
Low Temperature Sintering of (Bi1/2Na1/2)TiO3-SrTiO3 Ceramics and Their Ferroelectric and Piezoelectric Properties
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0.75(Bi1/2Na1/2)TiO3-0.25SrTiO3 (BNT-25ST) ceramics with high densities were successfully prepared at a sintering temperature of 1,000℃ by adding a mixture of 1 mol% CuO and 0.5 mol% Na2CO3 or 0.5 mol% CuO and 0.25 mol% Na2CO3. Double polarization-electric field (P-E) hysteresis curves and sprout-shaped bipolar strain-electric field (S-E) hysteresis curves with small negative strains were observed in the pristine and CuO-added BNT-25ST ceramics whereas the Na2CO3-added sample showed similar P-E and S-E curves to a typical ferroelectric. The pristine BNT-25ST ceramics showed an extremely large strain and a large-signal piezoelectric strain constant (d33*): 0.287 % at 80 kV/cm and 850 pm/V at 20 kV/cm. Similar values, 0.248 % at 80 kV/cm and 655 pm/V at 20 kV/cm, were obtained in the CuO-added sample. However, the pristine and CuO-added samples showed large hysteresis in unipolar S-E curves at an electric field of less than 20 kV/cm. The Na2CO3-added sample showed smaller values of the strain and d33* but displayed a linear change and small hysteresis in the unipolar S-E curve. The co-added sample with CuO and Na2CO3 displayed intermediate P-E and S-E hysteresis curves.
Abstract
0.75(Bi1/2Na1/2)TiO3-0.25SrTiO3 (BNT-25ST) ceramics with high densities were successfully prepared at a sintering temperature of 1,000℃ by adding a mixture of 1 mol% CuO and 0.5 mol% Na2CO3 or 0.5 mol% CuO and 0.25 mol% Na2CO3. Double polarization-electric field (P-E) hysteresis curves and sprout-shaped bipolar strain-electric field (S-E) hysteresis curves with small negative strains were observed in the pristine and CuO-added BNT-25ST ceramics whereas the Na2CO3-added sample showed similar P-E and S-E curves to a typical ferroelectric. The pristine BNT-25ST ceramics showed an extremely large strain and a large-signal piezoelectric strain constant (d33*): 0.287 % at 80 kV/cm and 850 pm/V at 20 kV/cm. Similar values, 0.248 % at 80 kV/cm and 655 pm/V at 20 kV/cm, were obtained in the CuO-added sample. However, the pristine and CuO-added samples showed large hysteresis in unipolar S-E curves at an electric field of less than 20 kV/cm. The Na2CO3-added sample showed smaller values of the strain and d33* but displayed a linear change and small hysteresis in the unipolar S-E curve. The co-added sample with CuO and Na2CO3 displayed intermediate P-E and S-E hysteresis curves.
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