Abstract
Rapidly quenched films in the PbONb 2O 5 system (10 to 66.7 mol% Nb 2O 5) were prepared by the use of a twin-roller type apparatus. The rapid quenching of melts in this system resulted in the formation of several new kinds of metastable phases. The films containing 10% Nb 2O 5 precipitated PbO solid solution of tetragonal form. In 15% Nb 2O 5, crystal phase having a face centered tetragonal structure was produced coexisting with another tetragonal metastable phase. In the compositions with 20 to 40% Nb 2O 5, crystal phase with a defect fluorite structure was obtained as the major product. Beyond 50% Nb 2O 5, there was no great difference in the phase constitutions between rapidly quenched films and solid state reacted samples. Annealing of the films at higher temperatures was also characterized by the appearance of metastable phases. The phase change by annealing was accompanied by a sharp increase in the dielectric constant.
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