Defect Structure of Lead Pyroniobates
The crystal structure of defect pyrochlores in the PbO - Nb2O5 system have been investigated by powder x-ray diffraction, electron diffraction, and high-resolution electron microscopy. Single-phase cubic pyrochlore was obtained for PbaNb2O5+n (n = 1.5); but for n > 1.5, discreet Pb-rich layers were observed in a manner similar to Ruddlesden Popper and Aurivillius phases. The appearance of these defect layers, which form on <111> planes of the parent pyrochlore, results in a lowering of the overall symmetry to trigonal.
Rick Ubic, J. C. Merry, A. C. Leach, and I. M. Reaney. "Defect Structure of Lead Pyroniobates" Institute of Physics Conference Series 168 (2001): 19-22.
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