Low temperature sintering of the Ba2Ti9O20 ceramics using B2O3/CuO and BaCu(B2O5) additives |
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| Affiliation: | 1. Department of Materials Science and Engineering, Korea University, 1-5 Ka, Anam-Dong, Sungbuk-Ku, Seoul 136-701, Republic of Korea;2. Korea Institute of Ceramic Engineering and Technology, 233-5, Gasan-Dong, Guemcheon-Gu, Seoul 153-801, Republic of Korea;3. New Materials Evaluation Center, Korea Research Institute of Standard and Science, Deaduk Science Town, Taejeon 305-600, Republic of Korea;1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, International Center for Dielectric Research, Xi?an Jiaotong University, Xi?an 710049, Shaanxi, China;2. Xi?an Jiaotong University Suzhou Academy, Suzhou 215123, Jiangsu, China |
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| Abstract: | The effects of B2O3/CuO and BaCu(B2O5) additives on the sintering temperature and microwave dielectric properties of Ba2Ti9O20 ceramics were investigated. The B2O3 added Ba2Ti9O20 ceramics were not able to be sintered below 1000 °C. However, when both CuO and B2O3 were added, they were sintered below 900 °C and had the good microwave dielectric properties. It was suggested that a liquid phase with the composition of BaCu(B2O5) was formed during the sintering and assisted the densification of the Ba2Ti9O20 ceramics at low temperature. BaCu(B2O5) powders were produced and used to reduce the sintering temperature of the Ba2Ti9O20 ceramics. Good microwave dielectric properties of Qxf = 16,000 GHz, ?r = 36.0 and τf = 9.11 ppm/°C were obtained for the Ba2Ti9O20 ceramics containing 10.0 mol% BaCu(B2O5) sintered at 875 °C for 2 h. |
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