| 학회 |
한국재료학회 |
| 학술대회 |
2009년 봄 (05/21 ~ 05/22, 무주리조트) |
| 권호 |
15권 1호 |
| 발표분야 |
전자재료 |
| 제목 |
Dielectric and piezoelectric properties of 0.94(Bi0.5Na0.5)TiO3-0.06BaTiO3 lead-free ceramics |
| 초록 |
Lead-free piezoelectric 0.94(Bi0.5Na0.5)TiO3-0.06BaTiO3 [BNBT6] ceramics with morphotropic phase boundary (MPB) were fabricated by the solid state sintering method. The effects of sintering temperature on piezoelectric properties and the dielectric characteristics of BNBT6 ceramic was investigated. The BNBT6 ceramics heat-treated at 1150 oC for 2h exhibited a maxium piezoelectricity, piezoelectric coefficient d33 = 180 pC/N and electromechanical coupling constant kp = 35%. The dielectric permittivity exibited the relaxor behavior at a phase transition from ferroelectric to antiferroelectric and the freezing temperature is about 80 oC. Above 500 oC, Z〃 vs log frequency plots show peaks and the peak positions shift to higher frequencies with increasing in temperature. The activation energy value is 2.02 eV indicating that possibly the sodium ion may be responsible for conduction mechanism. |
| 저자 |
이명환1, 이성찬1, 성연수1, 조종호1, 김명호1, 최병춘2, 송태권1
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| 소속 |
1창원대, 2부경대 |
| 키워드 |
Lead-free piezoelectric; MPB; d33; activation energy
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| E-Mail |
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