| 학회 |
한국재료학회 |
| 학술대회 |
2007년 가을 (11/02 ~ 11/02, 성균관대학교) |
| 권호 |
13권 2호 |
| 발표분야 |
전자재료 |
| 제목 |
Microstructural, dielectric and piezoelectric properties of A- and B-site Mn3+ doped-(Bi1/2Na1/2)TiO3 lead-free ceramics |
| 초록 |
(Bi1/2Na1/2)TiO3 (BNT) has been attracted much attention as piezoelectric ceramics to replace Pb(Zr,Ti)O3 (PZT)-based piezoelectronic devices. The application of BNT ceramics for piezoelectrics is limited by low depolarization temperature, difficulty of poling due to their high coercive fields and self-heating problem because of high dielectric loss. It has been generally known that compositionally modified PZT ceramics are used for the dielectric and piezoelectric applications with their improved electrical properties. In this work, we have investigated the microstructure, dielectric and piezoelectric properties of A (as donor)- and B (as acceptor)-site Mn3+ doped-BNT ceramics prepared by an ordinary solid state reaction method. The polycrystalline structure of the samples has a single rhombohedral perovskite structure. Grain sizes increase as the contents of Mn ion doping. The values of piezoelectric coefficient and mechanical quality factor increase slightly as Mn ion doping increases. From PE hysteresis curves the coercive electric field decreases rapidly for small Mn additives and then maintains constantly and the remanent polarizations have high value compared with pure BNT. The effects of A- and B-site Mn3+ doped-BNT ceramics are same but act differently in the quantity of Mn ion doping. |
| 저자 |
Jong-Ho Cho1, Hong-Goo Yeo2, Yeon-Soo Sung3, Tae-Kwon Song4, Myong-Ho Kim1
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| 소속 |
1School of Nano & Advanced Materials Engineering, 2Changwon National Univ., 3Changwon, 4Gyongnam 641-773 |
| 키워드 |
Lead-free piezoceramics; ABO3 perovskite; Doping; BNT
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| E-Mail |
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