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Structure and Dielectric Properties of Lead Pyrochlores
Journal of the American Ceramic Society (2002)
  • Rick Ubic, Boise State University
  • Ian M. Reaney, the university of sheffield

This work investigates the structure and stability of the pyrochlore solid solution PbnNb2O5+n using a combination of high-resolution electron microscopy and electron diffraction. The microwave dielectric properties of the series 1.5 ≤n≤3.0 have been established, and the effect of the substitution of Ta5+ for Nb5+ on dielectric properties has also been investigated for n= 1.5 and 2.0. Single-phase cubic pyrochlore was obtained for n= 1.5. Compositions for which n > 1.5 showed discreet PbO-rich layers on {111}cubic planes between alternating slabs of pyrochlore, similar in appearance to Ruddlesden–Popper phases. The occurrence of these layers results in a lowering of the overall symmetry to trigonal, and their presence was found to have a profound effect on the microwave dielectric properties.

  • structure,
  • dielectric materials/properties,
  • pyrochlore
Publication Date
Citation Information
Rick Ubic and Ian M. Reaney. "Structure and Dielectric Properties of Lead Pyrochlores" Journal of the American Ceramic Society Vol. 85 Iss. 10 (2002)
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