| Synthesis of Monodispersed Barium Titanate Nanopowders by Alkoxide-Hydroxide Sol-Precipitation Method |
| Song-Hak Yoon, Min-Gyu Kim1, Nam-Soo Shin1, In-Sung Kim2, Sung-Gi Baik |
Department of Materials Science and Engineering, Pohang University of Science and Technology
1Pohang Accelerator Laboratory, Pohang University of Science and Technology
2Electric and Magnetic Devices Research Group, Korea Electrotechnology Research Institute |
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| ABSTRACT |
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Barium titanate nanoparticles were synthesized under N$_2$ atmosphere by the hydrolysis and condensation of barium hydroxide octahydrate and titanium (IV) isopropoxide. The synthesized particles were aggregates of nanosized primary particles. The primary particles of about 20-50 nm in diameter became building blocks of larger secondary particles, which are in most cases spherical in shape. The size and morphological evolution of secondary particles are strongly related to the precursor concentration. The observations suggest that formation and control of secondary particles is an essential step in the alkoxidehydroxide sol-precipitation process to obtain monodispersed barium titanate nanopowders. |
| Key words:
Barium titanate, Nanoparticles, Alkoxide-hydroxide sol-precipitation, Aggregation |
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