Effective dielectric loss (tan δ) reduction of CaCu3Ti4O12 (CCTO) via various addition of glasses |
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| Authors: | Mohd Fariz Ab Rahman Mohd Fadzil Ain Julie Juliewatty Mohamed Zainal Arifin Ahmad |
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| Affiliation: | 1. Structural Materials Niche Area, School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Nibong Tebal, Penang, Malaysia;2. School of Electrical and Electronics Engineering, Universiti Sains Malaysia, Nibong Tebal, Penang, Malaysia;3. Faculty of Bioengineering and Technology, Universiti Malaysia Kelantan Jeli Campus, Jeli, Kelantan, Malaysia |
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| Abstract: | Addition of various glasses has successfully reduced tan δ of CCTO-based ceramics. Less amounts (0-1.0 wt%) of glasses (BaO-SrO-Nb2O5-B2O3-SiO2 BSNBS] and SrO-B2O3-SiO2 SBS], respectively) were added into pure CCTO and sintered at 1040°C for 10 hours. The phase formation and microstructure of each sample were characterized using X-ray diffraction and scanning electron microscopy, respectively. The dielectric behavior of the samples was measured at 1 MHz. The addition of BSNBS and SBS glasses (≤0.5 wt%) successfully reduced tan δ of CCTO from 0.5 until 0.4 and 0.39, respectively, and simultaneously increased εr. Smaller tan δ and ?r were further obtained when the added glasses were more than 0.5 wt%. These behaviors were due to segregation of glasses together with precipitation of CuO which decreased the grain size, and caused the presence of pores at grain boundaries. Therefore, small amount of various additions of glasses could modify the CCTO dielectric properties. |
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| Keywords: | CaCu3Ti4O12 dielectric properties glass microstructure |
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