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

Hyuk Joon Youn, Clive A. Randall, Ang Chen, Thomas R. Shrout, Michael T. Lanagan

Research output: Contribution to journalArticle

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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 (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
Volume17
Issue number6
DOIs
StatePublished - Jan 1 2002

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Dielectric relaxation
Dielectric properties
dielectric properties
Permittivity
Microwaves
ceramics
permittivity
microwaves
Capacitance
capacitance
slopes
low frequencies
Temperature
temperature dependence
symmetry

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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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 (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. / Youn, Hyuk Joon; Randall, Clive A.; Chen, Ang; Shrout, Thomas R.; Lanagan, Michael T.

In: Journal of Materials Research, Vol. 17, No. 6, 01.01.2002, p. 1502-1506.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Youn, Hyuk Joon

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AU - Lanagan, Michael T.

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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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