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Proceedings of the 7th National Conference on Functional Materials and Applications (FMA 2010 E-BOOK)

Changsha,China,10.16-10.18,2010

ISBN: 978-1-935068-41-9 Scientific Research Publishing, USA

E-Book 2313pp Pub. Date: October 2010

Category: Chemistry & Materials Science

Price: $360

Title: Study on Microstructures and Dielectric Properties of Barium Strontium Titanate Ceramics Co-Doped Al2O3-MgO
Source: Proceedings of the 7th National Conference on Functional Materials and Applications (FMA 2010 E-BOOK) (pp 149-153)
Author(s): Guo-xin Hu, College of Material Science, Northwestern Polytechnical University, Xi′an, China
Feng Gao, College of Material Science, Northwestern Polytechnical University, Xi′an, China
Xiao Cao, College of Material Science, Northwestern Polytechnical University, Xi′an, China
Liang-liang Liu, College of Material Science, Northwestern Polytechnical University, Xi′an, China
Chang-sheng Tian, College of Material Science, Northwestern Polytechnical University, Xi′an, China
Abstract: The Ba0.6Sr0.4TiO3 (BSTO) ceramics were prepared by traditional electrical ceramic methods. Effects of co-doping low dielectric constant oxides Al2O3 and MgO on microstructures and dielectric properties of Ba0.6Sr0.4TiO3 ceramics were investigated. The results show that BSTO/MgO/Al2O3(BMA) ceramics can be sintered at 1350~1450℃. The main crystal phases are Ba0.6Sr0.4TiO3 and MgAl2O4. Al3+ is easier to enter Ba0.6Sr0.4TiO3 lattice in the replacement of Ti4+ than Mg2+. When Al2O3 content exceeds 25wt%, Al2O3 will react with BaAl2O4 to generate a new phase BaAl12O19. Proper amount of Al2O3-MgO can reduce the dielectric constant of BSTO ceramics which also can ensure the higher tunability. There is obvious frequency dispersion characteristic in BMA ceramics with the increase of Al2O3. When Al2O3 content exceeds 25wt%, two dielectric peaks are observed in the temperature spectrums of ceramics, which decrease and broaden. When Al2O3 content is 20wt%, the tunability amounts to 33.9% under a bias field of 1.0kV/mm dc.
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