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Dielectric Relaxation and Microwave Dielectric Properties of Bi2O3–ZnO–Ta2O5 Ceramics

Published online by Cambridge University Press:  31 January 2011

Hyuk-Joon Youn ,
Clive Randall ,
Ang Chen ,
Tom Shrout  and
Michael T. Lanagan
Hyuk-Joon Youn
Affiliation:
Center for Dielectric Studies, Material Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
Clive Randall
Affiliation:
Center for Dielectric Studies, Material Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
Ang Chen
Affiliation:
Center for Dielectric Studies, Material Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
Tom Shrout
Affiliation:
Center for Dielectric Studies, Material Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
Michael T. Lanagan
Affiliation:
Center for Dielectric Studies, Material Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
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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.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 6 , June 2002 , pp. 1502 - 1506
Copyright
Copyright © Materials Research Society 2002

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