Hydrothermal synthesis of carbonate-free submicron-sized barium titanate from an amorphous precursor: Synthesis and characterization |
| |
Authors: | Murat Ö zen,Myrjam MertensJan Luyten,Frans SnijkersHans D&rsquo Hondt,Pegie Cool |
| |
Affiliation: | a Laboratory of Adsorption and Catalysis, Department of Chemistry, University of Antwerpen (UA), Universiteitsplein 1, B-2610 Wilrijk, Belgium b Flemish Institute for Technology Research (VITO), Boeretang 200, B-2400 Mol, Belgium c EMAT, University of Antwerpen (UA), Groenenborgerlaan 171, B-2020 Antwerpen, Belgium |
| |
Abstract: | In this paper, the amorphous barium titanate precursor was prepared by the peroxo-hydroxide method and post-treated by various drying procedures, such as: room temperature drying, room temperature vacuum drying and vacuum drying at 50 °C. The objective in the latter two treatments was to increase the Ti-O-Ba bonds of the precursor. The post-treated precursors were compared with the untreated (i.e., ‘wet’) precursor. Also, a barium titanate precursor was prepared by an alkoxide route. Afterwards, the precursors were hydrothermally treated at 200 °C in a 10 M NaOH solution. Vacuum drying of the precursor seemingly promoted the formation of Ti-O-Ti bonds in the hydrothermal end-product. The low Ba:Ti ratio (0.66) of the alkoxide-route prepared precursor lead to a multi-phase hydrothermal product with BaTiO3 as the main phase. In contrast, phase pure BaTiO3, i.e. without BaCO3 contamination, was obtained for the precursor which was dried at room temperature. Cube-shaped and highly crystalline BaTiO3 particles were observed by electron microscopy for the hydrothermally treated peroxo-hydroxide-route prepared precursor. |
| |
Keywords: | A. Powders: chemical preparation B. Electron microscopy B. X-ray methods D. BaTiO3 and titanates IR/Raman spectroscopy |
本文献已被 ScienceDirect 等数据库收录! |
|