Abstract
The preparation of single-phase perovskite Pb( Mg 1 3 Nb 2 3 ) O 3 powder or ceramics has been known to be quite difficult by means of the conventional mixed oxide method. Its high dielectric constant, however, makes Pb( Mg 1 3 Nb 2 3 ) O 3 one of the most promising perovskite materials. In the present paper, a conventional mixed oxide method was reinvestigated and non-conventional ceramic processing methods such as the PbO flux method and a KCl molten salt method have been performed to prepare single-phase Pb( Mg 1 3 Nb 2 3 ) O 3 powder. It was found that the KCl molten salt method is extremely successful only when excess PbO is present in the salt, because pyrochlore Pb 1·83Nb 1·71Mg 0·29O 6·39, which inevitably appears upon synthesizing Pb( Mg 1 3 Nb 2 3 ) O 3 , can be completely transformed to perovskite.
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