Abstract
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 (a phase) exhibited a dielectric constant of 71 at low frequency which decreased to 64 at approximately 10 GHz. A lower symmetry zirconolite Bi2(Zn1/3Ta2/3)2O7 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.
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Youn, HJ., Randall, C., Chen, A. et al. Dielectric relaxation and microwave dielectric properties of Bi2O3-ZnO-Ta2O5 ceramics. Journal of Materials Research 17, 1502–1506 (2002). https://doi.org/10.1557/JMR.2002.0223
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DOI: https://doi.org/10.1557/JMR.2002.0223