Improved microwave dielectric properties of B2O3-doped Nd(Co1/2Ti1/2)O3 ceramics with near zero temperature coefficient of resonant frequency

Ching Fang Tseng, Cheng-Liang Huang

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Abstract

The microwave dielectric properties and the microstructures of Nd(Co1/2Ti1/2)O3 ceramics prepared by conventional solid-state route have been studied. The prepared Nd(Co1/2Ti1/2)O3 exhibited a mixture of Co and Ti showing 1:1 order in the B-site. It is found that low-level doping of B2O3 (up to 0.75 wt.%) can significantly improve the density and dielectric properties of Nd(Co1/2Ti1/2)O3 ceramics. Nd(Co1/2Ti1/2)O3 ceramics with additives could be sintered to a theoretical density higher than 98.5% at 1320 °C. Second phases were not observed at the level of 0.25-0.75 wt.% B2O3 addition. The temperature coefficient of resonant frequency (τf) was not significantly affected, while the dielectric constants (εr) and the unloaded quality factors Q were effectively promoted by B2O3 addition. At 1320 °C/4 h, Nd(Co1/2Ti1/2)O3 ceramics with 0.75 wt.% B2O3 addition possesses a dielectric constant (εr) of 27.2, a Q × f value of 153,000 GHz (at 9 GHz) and a temperature coefficient of resonant frequency (τf) of 0 ppm/°C. The B2O3-doped Nd(Co1/2Ti1/2)O3 ceramics can find applications in microwave devices requiring low sintering temperature.

Original languageEnglish
Pages (from-to)9-16
Number of pages8
JournalMaterials Research Bulletin
Volume42
Issue number1
DOIs
Publication statusPublished - 2007 Jan 18

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Dielectric properties
resonant frequencies
dielectric properties
Natural frequencies
Microwaves
ceramics
microwaves
Permittivity
coefficients
Microwave devices
Temperature
temperature
permittivity
Sintering
Doping (additives)
Microstructure
Q factors
sintering
routes
boron oxide

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Improved microwave dielectric properties of B2O3-doped Nd(Co1/2Ti1/2)O3 ceramics with near zero temperature coefficient of resonant frequency",
abstract = "The microwave dielectric properties and the microstructures of Nd(Co1/2Ti1/2)O3 ceramics prepared by conventional solid-state route have been studied. The prepared Nd(Co1/2Ti1/2)O3 exhibited a mixture of Co and Ti showing 1:1 order in the B-site. It is found that low-level doping of B2O3 (up to 0.75 wt.{\%}) can significantly improve the density and dielectric properties of Nd(Co1/2Ti1/2)O3 ceramics. Nd(Co1/2Ti1/2)O3 ceramics with additives could be sintered to a theoretical density higher than 98.5{\%} at 1320 °C. Second phases were not observed at the level of 0.25-0.75 wt.{\%} B2O3 addition. The temperature coefficient of resonant frequency (τf) was not significantly affected, while the dielectric constants (εr) and the unloaded quality factors Q were effectively promoted by B2O3 addition. At 1320 °C/4 h, Nd(Co1/2Ti1/2)O3 ceramics with 0.75 wt.{\%} B2O3 addition possesses a dielectric constant (εr) of 27.2, a Q × f value of 153,000 GHz (at 9 GHz) and a temperature coefficient of resonant frequency (τf) of 0 ppm/°C. The B2O3-doped Nd(Co1/2Ti1/2)O3 ceramics can find applications in microwave devices requiring low sintering temperature.",
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N2 - The microwave dielectric properties and the microstructures of Nd(Co1/2Ti1/2)O3 ceramics prepared by conventional solid-state route have been studied. The prepared Nd(Co1/2Ti1/2)O3 exhibited a mixture of Co and Ti showing 1:1 order in the B-site. It is found that low-level doping of B2O3 (up to 0.75 wt.%) can significantly improve the density and dielectric properties of Nd(Co1/2Ti1/2)O3 ceramics. Nd(Co1/2Ti1/2)O3 ceramics with additives could be sintered to a theoretical density higher than 98.5% at 1320 °C. Second phases were not observed at the level of 0.25-0.75 wt.% B2O3 addition. The temperature coefficient of resonant frequency (τf) was not significantly affected, while the dielectric constants (εr) and the unloaded quality factors Q were effectively promoted by B2O3 addition. At 1320 °C/4 h, Nd(Co1/2Ti1/2)O3 ceramics with 0.75 wt.% B2O3 addition possesses a dielectric constant (εr) of 27.2, a Q × f value of 153,000 GHz (at 9 GHz) and a temperature coefficient of resonant frequency (τf) of 0 ppm/°C. The B2O3-doped Nd(Co1/2Ti1/2)O3 ceramics can find applications in microwave devices requiring low sintering temperature.

AB - The microwave dielectric properties and the microstructures of Nd(Co1/2Ti1/2)O3 ceramics prepared by conventional solid-state route have been studied. The prepared Nd(Co1/2Ti1/2)O3 exhibited a mixture of Co and Ti showing 1:1 order in the B-site. It is found that low-level doping of B2O3 (up to 0.75 wt.%) can significantly improve the density and dielectric properties of Nd(Co1/2Ti1/2)O3 ceramics. Nd(Co1/2Ti1/2)O3 ceramics with additives could be sintered to a theoretical density higher than 98.5% at 1320 °C. Second phases were not observed at the level of 0.25-0.75 wt.% B2O3 addition. The temperature coefficient of resonant frequency (τf) was not significantly affected, while the dielectric constants (εr) and the unloaded quality factors Q were effectively promoted by B2O3 addition. At 1320 °C/4 h, Nd(Co1/2Ti1/2)O3 ceramics with 0.75 wt.% B2O3 addition possesses a dielectric constant (εr) of 27.2, a Q × f value of 153,000 GHz (at 9 GHz) and a temperature coefficient of resonant frequency (τf) of 0 ppm/°C. The B2O3-doped Nd(Co1/2Ti1/2)O3 ceramics can find applications in microwave devices requiring low sintering temperature.

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