Dielectric relaxation and microwave dielectric properties of Bi2O3-ZnO-Ta2O5 ceramics

Hyuk Joon Youn, Clive Randall, Ang Chen, Tom Shrout, Michael T. Lanagan

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The permittivity of two primary phases within the Bi2O3-ZnO-Ta2O5 system was measured from 100 Hz to approximately 8.7 GHz. A cubic pyrochlore (Bi3/2Zn1/2)(Zn1/2Ta3/2) O7 phase (α phase) exhibited a dielectric constant of 71 at low frequency which decreased to 64 approximately 10 GHz. A lower symmetry zirconolite Bi2(Zn1/3Ta2/3)2 O7 phase (β phase) was also measured and had a frequency independent dielectric constant of 60. The temperature dependence of the capacitance (τC), measured from -55 to 120°C, was 78 ppm/°C for the β phase and nonlinear for the α phase having no unique slope. The primary difference in dielectric properties between these two phases was a low-temperature relaxation of the α phase, which is modeled as a basic Debye-type relaxation.

Original languageEnglish (US)
Pages (from-to)1502-1506
Number of pages5
JournalJournal of Materials Research
Issue number6
StatePublished - Jun 2002

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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