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Alternative Title: Dielectric, Ferroelectric and Electrical Properties of Bi₄Ti₃O_(12) Ceramics with Nd/Nb Co-doping

Abstract: Nd and Nb doped BNTN ferroelectic ceramics were prepared by ordinary sintering method at 1150℃. the effects of Nd/Nb co-doping in A/B-site on dielectric, ferroelectric and electrical properties were studied. The Nd/Nb co-doping decreased the low-frequency dielectric dispersion and electrical conductivity. The BNTN ceramics exhibited a high remanent polarization compared to that of BIT. in particular, The Nd/Nb co-doping improved the ferroelectric properties with high remanent polarization. The effects of Nd/Nb co-doping on the dielectric, ferroelectric and electrical properties were investigated by using XRD, dielectric constant, conductivity and ferroelectric P-E hysteresis loop measuremets.

URI: https://repository.pknu.ac.kr:8443/handle/2021.oak/10959
http://pknu.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001955391

Table Of Contents: Abstract = iii
1. 서론 = 1
2. 이론 = 4
2.1 강유전체 = 4
2.2 비스무스 층상 구조 = 6
2.3 유전상수와 유전측정 = 8
2.4 강유전 이력곡선 = 10
3. 실험방법 = 12
3.1 세라믹의 제조 = 12
3.2 XRD 에 의한 구조분석 = 15
3.3 SEM 에 의한 표면분석 = 16
3.4 자발분극과 이력곡선 측정 = 16
3.5 유전상수 및 전기전도도 측정 = 17
4. 실험결과 및 고찰 = 19
4.1 세라믹의 구조와 특성 = 19
4.2 BNTN의 이력특성 = 24
4.3 BNTN의 유전특성 = 31
5. 결론 = 43
참고문헌 = 45

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