Skip to main content
Microwave Properties of Doped Lead Pyroniobate
Journal of the European Ceramic Society (2001)
  • Rick Ubic, Boise State University
  • I. M. Reaney, University of Sheffield

The microwave dielectric properties of the series PbnNb2O5+n (1.3 ≤ n ≤ 3.0) have been established in this work. Single-phase cubic pyrochlore was obtained for n = 1.5. Compositions for which n > 1:5 showed discreet PbO-rich layers between alternating slabs of pyrochlore, similar in appearance to Ruddlesden–Popper phases. These layers have a profound effect on the microwave properties, with n = 2 yielding the lowest τf (814 ppm/ºC) in the series. Attempts were made to reduce τf further by both Mg- and Ta-doping. The properties of Mg-doped Pb1.5Nb2O6.5 were investigated for several concentrations of Mg (on the Nb site) up to Pb1.5(Mg0.24Nb1.76)O6.14, but none showed great promise. Isovalent doping with Ta, PbnTaxNb2-xO5+n, was much more successful. Both the n = 1.5 as well as the n = 2 compositions showed a marked decrease in τf with an increasing amount of Ta.

Publication Date
Citation Information
Rick Ubic and I. M. Reaney. "Microwave Properties of Doped Lead Pyroniobate" Journal of the European Ceramic Society Vol. 21 Iss. 15 (2001)
Available at: