Authors: S Y Wu W Zhang X M Chen
Publish Date: 2009/07/11
Volume: 21, Issue: 5, Pages: 450-455
Abstract
Hydrothermal synthesis of NaNbO3 fine powders was investigated and the formation mechanism was revealed The lowest temperature to form NaNbO3 powders was about 140 °C An intermediate hexaniobate Na8Nb6O19·13H2O was formed first before the precursors were eventually converted to the perovskite phase The step of dissolving Nb2O5 powders in OH− solution and forming Nb6O19 8− ion was very important to the synthesis of NaNbO3 For OH− = 30 M Nb2O5 had the highest yield There was another dissolvable sodium niobate in the hydrothermal system which was stable when OH− = 12 M The reaction mechanism was in situ transformation The reaction speed first increased then decreased with OH− High OH− is not always favorable in preparing perovskite NaNbO3 and there is an optimum OH−
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