Pyrochlore-related phases in the lead oxide-tantalum oxide system

Title Pyrochlore-related phases in the lead oxide-tantalum oxide system
Author: Scott, H G
Journal of Solid State Chemistry, 1982
1982
http://www.sciencedirect.com/science/article/pii/0022459682902225
More details: Pyrochlore-related phases in the PbO?�?Ta2O5 system were reinvestigated. Three such phases are described: cubic Pb1.5Ta2O6.5 with a narrow range of composition, rhombohedral Pb22Ta18O67, and orthorhombic Pb14Ta10O39. A new pyrochlore-related structure is proposed for the orthorhombic phase. There is also a range of rhombohedral solid solution, which may be metastable only. The existence of the previously reported Pb2Ta2O7 is not confirmed.

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