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Preparation and ferroelectric properties of MnO2 doped BaTi2O5 ceramics by spark plasma sintering from the solid-state-calcined powder |
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| Authors: | Wenfeng Liu Shinya Tsukada Yukikuni Akishige |
| Affiliation: | 1. Research Project Promotion Institute, Shimane University, Matsue, Shimane, 690-8504, Japan 2. State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an, 710049, China 3. Faculty of Education, Shimane University, Matsue, Shimane, 690-8504, Japan |
| Abstract: | Dense BaTi2O5 are fabricated from the conventional calcined powder by using spark plasma sintering and by adding MnO2 as a dopant. The effects of the sintering temperature and the amount of MnO2 on the phase purity are symmetrically investigated. A pure BaTi2O5 phase is obtained under a condition with the sintering temperature of 1,055 °C and the amount of MnO2 doping of 0.2 wt% from the conventional powder calcined at 950 °C. The relative density of that ceramics is 98 %. The temperature dependence of dielectric property shows the Curie temperature (T c) of 446 °C with the peak value of 450. Besides, the ceramics polarization of 0.63 μC/cm2 and the coercive field of 2.0 kV/cm at room temperature, respectively. |
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