Hydrothermal Synthesis of BaTiO3 Nanopowders Using TiO2 Nanoparticles |
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| Authors: | Jae‐Min Han Mi‐Ri Joung Jin‐Seong Kim Youn‐Seon Lee Sahn Nahm Youn‐Kyu Choi Jong‐Hoo Paik |
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| Affiliation: | 1. Department of Materials Science and Engineering, Korea University, , Seongbuk‐gu, Seoul, 136‐701 Korea;2. Department of Information Technology‐Nano Science, KU‐KIST Graduate School of Converging Science and Technology, Korea University, , Seongbuk‐gu, Seoul, 136‐701 Korea;3. Advanced Materials Research Institute Samsung Fine Chemicals Co., Ltd, Samsung Material Research Complex, , Yeongtong‐Gu, Suwon, 443‐370 Korea;4. Korea Institute of Ceramic Engineering and Technology, , Seoul, 153‐801 Korea |
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| Abstract: | Anatase TiO2 nanoparticles, obtained by hydrolyzing titanium isopropoxide in distilled water, were used to synthesize BaTiO3 (BT) nanopowder by the hydrothermal method. When titanium isopropoxide was used, BT nanopowder with a low tetragonality of 1.0070 was formed because of the presence of OH? ions in the oxygen sites and Ba vacancies. However, by changing the titanium source from titanium isopropoxide to TiO2 nanoparticles, a homogeneous BT nanopowder with similar particle size and a high tetragonality of 1.0081 was synthesized. The size of the BT nanopowder particles was decreased by reducing the synthesis time. In particular, the BT nanopowder that was synthesized at 220°C for 16 h with a Ba/Ti molar ratio of 4.0 exhibited a high tetragonality of 1.0083 and a small particle size of 126.0 nm. |
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