Investigation of Ba1?xSrxTiO3 ceramics prepared from powders synthesized by the modified Pechini route |
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| Affiliation: | 1. Polytechnics University of Bucharest, 1-7 Gh. Polizu, P.O. Box 12-134, 011061 Bucharest, Romania;2. Institute for Energetics & Interphases, CNR, 6 Via de Marini, I-16149 Genoa, Italy;3. Alexandru Ioan Cuza University, 11 Bv. Carol I, 700506 Ia?i, Romania;4. S.C. METAV, Research & Development Bucharest, 31 C.A. Rosetti, 020011 Bucharest, Romania;5. Institute of Physical Chemistry Ilie Murgulescu of the Romanian Academy, 202 Spl. Independentei, 060021 Bucharest, Romania;1. Key laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, People''s Republic of China;2. Kunming Institute of Physics, Kunming 650223, People''s Republic of China;1. Laboratory of Dielectric Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;2. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi?an 710072, China;1. State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China;2. Laboratory of Dielectric Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;3. Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou 310027, China;4. College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310006, China;5. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China;2. School of Finance, Capital University of Economics and Business, Beijing, 100070, China |
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| Abstract: | Ba1?xSrxTiO3 (x = 0, 0.20, 0.25, 0.30 and 0.35) nanopowders were prepared by Pechini method from titanium isopropoxide, barium and strontium carbonates using citric acid as a chelating agent and ethylene glycol as an esterification agent. X-ray diffraction data show the formation of (Ba,Sr)TiO3 solid solutions, free from secondary phases as BaCO3 or Ti-rich oxides, when the polymeric precursors were calcined in air at 850 °C for 2 h. Ceramic pellets with relative density of 85–93% were obtained after sintering at 1350 °C for 3 h. High values of the dielectric constants (of ～1500–12,000), low losses at the room temperature and a shift of the ferro-para phase transition temperature in the range of 7–127 °C with x decreasing were found. Lower values of the Curie constant for higher x indicate the increase of the chemical and electrical local heterogeneity degree. |
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