Abstract

Phase equilibria studies in the systems (Pb xBa 1−x)Nb 2O 6, (Pb xSr 1−x)Nb 2O 6 and (Ba xSr 1−x)Nb 2O 6 have been made. Tetragonal 0, 2 <x<0, 5) and orthorhombic (0, 6 <x<1, 0) gungsten bronze solid solutions were observed in the first system for specimens heated at 1300°C. The same phenomenon occurs in the second system for the higher temperature of treatment of 1500°C. The only present phase, in the latter system for concentrations up to x = 0, 1, is a tetragonal tungsten bronze-type structure, for specimens heated only at 1500°C.

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