Low temperature sintering of BaCu(B2O5)-added BaO–Re2O3–TiO2 (Re = Sm,Nd) ceramics |
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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. National Engineering Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Jianshe Road, Chengdu 610054, PR China;2. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Jianshe Road, Chengdu 610054, PR China;1. Dept. of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan;2. Holy Stone Enterprise Co. Ltd., Taipei, Taiwan;3. Dept. of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan;1. Laboratory of Functional Films, School of Materials Science and Engineering, Xi’an University of Technology, Xi''an 710048, China;2. Materials Research and Education Center, Auburn University, Auburn, AL 36849, USA |
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| Abstract: | The sintering temperature of BaSm2Ti4O12 (BST) and BaNd2Ti5O14 (BNT) ceramics was approximately 1350 °C and decreased to 875 °C with the addition of BaCu(B2O5) (BCB) ceramic powder. The presence of the liquid phase was responsible for the decrease of the sintering temperature. The liquid phase is considered to have a composition similar to the BaO-deficient BCB. The bulk density and dielectric constant (ɛr) of the specimens increased and reached saturated value with increasing BCB content. The Q-value initially increased with the addition of BCB, but decreased considerably when a large amount of BCB was added, because of the presence of the liquid phase. Good microwave dielectric properties of Q × f = 4500 GHz, ɛr = 60 and τf = −30 ppm/°C were obtained for the 16.0 mol% BCB-added BST ceramics sintered at 875 °C for 2 h. Moreover, the BST and BNT ceramics containing BCB show good compatibility with silver metal. |
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