Syntheses of nanocrystalline BaTiO3 and their optical properties |
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| Authors: | J Yu J Chu M Zhang |
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| Institution: | (1) National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai 200083, P.R. China, CN;(2) National Laboratory of Solid State Microstructures and Center of Material Analysis, Nanjing University, Nanjing 210093, P.R. China, CN |
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| Abstract: | Stoichiometric and titanium-excess nanocrystalline barium titanates were synthesized using a hydrothermal process at various
hydrothermal temperatures and with further heat treatment at 500 °C and 900 °C. Owing to the different process conditions,
the excess titanium exists in different states and configurations within the nanocrystalline BaTiO3 matrix; this was demonstrated by X-ray diffraction, Raman scattering, and photoluminescence. In these nanocrystalline BaTiO3, the 590, 571, 543 and 694 nm light emission bands were observed; mechanisms leading to such emissions were also discussed.
Received: 23 February 2001 / Accepted: 10 May 2001 / Published online: 27 June 2001 |
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| Keywords: | PACS: 78 55 Hx 61 46 +w 77 84 Dy |
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