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Article
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
Abstract

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.

Keywords
  • structure,
  • dielectric materials/properties,
  • pyrochlore
Publication Date
2002
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)
Available at: http://works.bepress.com/rick_ubic/23/