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Author(s): |
Yan Chen, College of Material s Science and Engineering, Nanjing University of Technology, Nanjing 210009, China;
Le Zhang, College of Material s Science and Engineering, Nanjing University of Technology, Nanjing 210009, China;
Peng-de Han, College of Material s Science and Engineering, Nanjing University of Technology, Nanjing 210009, China;
Li-xi Wang, College of Material s Science and Engineering, Nanjing University of Technology, Nanjing 210009, China;
Qi-tu Zhang, College of Material s Science and Engineering, Nanjing University of Technology, Nanjing 210009, China;Jiangsu Provincial Key Laboratory of New Material s of Inorganic and Its Composites, |
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Abstract: |
The BaO-CeO2-kTiO2 microwave dielectric ceramics（with k is 3.5, 4, 4.5, 5）have been prepared with CeO2 as starting material by traditional solid state reaction method in view of dispute which exist in research of BaO-CeO2-TiO2. The relation between phase composition, micromorphology and dielectric properties for the ceramics were investigated. The results show that the sintering temperatures of samples with different k values are all 1240℃. CeO2 does not participate in forming multiple compounds. BaO and TiO2 form multiple barium titanate in varying proportions. The existence of BaTi4O9、 Ba2Ti9O20 has a significant effect on its dielectric properties, and form solid solutions with CeO2. The samples with different k values all exhibit excellent dielectric properties whose Q·f values are all more than 104GHz. When k is 5, ?r =47.5, which is the largest. The lowest tanδ=2.68×10-4 when k is 3.5 at 1MHz, and its Q·f values reach 25007GHz at microwave frequency.
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