Abstract
Effects of the chloride ions on the synthesis of tetragonal BaTiO 3 in the microwave-hydrothermal (MH) and conventional hydrothermal (CH) processes were investigated. Such effects were found to be dependent of the synthesis method and temperature. In the MH process performed at 240 °C, tetragonal BaTiO 3 powders of c/ a ratios larger than 1.009 were readily prepared whether the chloride ions were present or not. At the lower temperature of 220 °C, however, the c/ a ratio in the MH BaTiO 3 was only 1.0061 in the absence of the chloride ions but increased to 1.0084 aided by the chloride ions. In the CH process, the chloride ions were observed to play an invariably important role in the preparation of tetragonal BaTiO 3. In contrast, the chloride ions appeared to have less influence on the particle size of the hydrothermal BaTiO 3 in a relatively short period of time.
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