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

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

doi:10.1557/JMR.2002.0223

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

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

Research output: Contribution to journal › Article › peer-review

49 Scopus citations

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 (Bi_3/2Zn_1/2)(Zn_1/2Ta_3/2) 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(Zn_1/3Ta_2/3)₂ O₇ phase (β phase) was also measured and had a frequency independent dielectric constant of 60. The temperature dependence of the capacitance (τ_C), 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 language	English (US)
Pages (from-to)	1502-1506
Number of pages	5
Journal	Journal of Materials Research
Volume	17
Issue number	6
DOIs	https://doi.org/10.1557/JMR.2002.0223
State	Published - Jun 2002

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Dielectric relaxation and microwave dielectric properties of Bi2O3-ZnO-Ta2O5 ceramics",

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 (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.",

author = "Youn, {Hyuk Joon} and Clive Randall and Ang Chen and Tom Shrout and Lanagan, {Michael T.}",

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T1 - Dielectric relaxation and microwave dielectric properties of Bi2O3-ZnO-Ta2O5 ceramics

AU - Youn, Hyuk Joon

AU - Randall, Clive

AU - Chen, Ang

AU - Shrout, Tom

AU - Lanagan, Michael T.

PY - 2002/6

Y1 - 2002/6

N2 - 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.

AB - 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.

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

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