Characterization and dielectric behavior of a new dielectric ceramics Ca(Mg1/3Nb2/3)O3-(Ca0.8Sr0.2)TiO3 at microwave frequencies

Cheng Liang Huang; Jhih Yong Chen; Bing Jing Li

doi:10.1016/j.jallcom.2009.04.132

Characterization and dielectric behavior of a new dielectric ceramics Ca(Mg_1/3Nb_2/3)O₃-(Ca_0.8Sr_0.2)TiO₃ at microwave frequencies

Cheng Liang Huang
, Jhih Yong Chen
, Bing Jing Li

Department of Electrical Engineering

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

25 Citations (Scopus)

Abstract

The crystal structures, phase compositions and the microwave dielectric properties of the (1-x)Ca(Mg_1/3Nb_2/3)O₃-x(Ca_0.8Sr_0.2)TiO₃ perovskite-based composites prepared by the conventional solid state route have been investigated. The formation of solid solution is confirmed by the XRD patterns. A rapid grain growth is observed at temperatures higher than 1470 °C, which would lead to a decrease in the density and Q × f of the ceramics. The temperature coefficient of resonant frequency increases with increasing (Ca_0.8Sr_0.2)TiO₃ content and tunes through near zero at x = 0.3. Specimen using 0.7Ca(Mg_1/3Nb_2/3)O₃-0.3(Ca_0.8Sr_0.2)TiO₃ possesses an excellent combination of microwave dielectric properties: ε_r ∼ 43.75, Q × f ∼ 45,200 GHz (where f = 6.3 GHz is the resonant frequency) and τ_f ∼ -4.2 ppm/°C. It is proposed as a suitable candidate material for small-sized GPS patch antennas.

Original language	English
Pages (from-to)	494-497
Number of pages	4
Journal	Journal of Alloys and Compounds
Volume	484
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2009.04.132
Publication status	Published - 2009 Sept 18

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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title = "Characterization and dielectric behavior of a new dielectric ceramics Ca(Mg1/3Nb2/3)O3-(Ca0.8Sr0.2)TiO3 at microwave frequencies",

abstract = "The crystal structures, phase compositions and the microwave dielectric properties of the (1-x)Ca(Mg1/3Nb2/3)O3-x(Ca0.8Sr0.2)TiO3 perovskite-based composites prepared by the conventional solid state route have been investigated. The formation of solid solution is confirmed by the XRD patterns. A rapid grain growth is observed at temperatures higher than 1470 °C, which would lead to a decrease in the density and Q × f of the ceramics. The temperature coefficient of resonant frequency increases with increasing (Ca0.8Sr0.2)TiO3 content and tunes through near zero at x = 0.3. Specimen using 0.7Ca(Mg1/3Nb2/3)O3-0.3(Ca0.8Sr0.2)TiO3 possesses an excellent combination of microwave dielectric properties: εr ∼ 43.75, Q × f ∼ 45,200 GHz (where f = 6.3 GHz is the resonant frequency) and τf ∼ -4.2 ppm/°C. It is proposed as a suitable candidate material for small-sized GPS patch antennas.",

author = "Huang, \{Cheng Liang\} and Chen, \{Jhih Yong\} and Li, \{Bing Jing\}",

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AU - Huang, Cheng Liang

AU - Chen, Jhih Yong

AU - Li, Bing Jing

PY - 2009/9/18

Y1 - 2009/9/18

N2 - The crystal structures, phase compositions and the microwave dielectric properties of the (1-x)Ca(Mg1/3Nb2/3)O3-x(Ca0.8Sr0.2)TiO3 perovskite-based composites prepared by the conventional solid state route have been investigated. The formation of solid solution is confirmed by the XRD patterns. A rapid grain growth is observed at temperatures higher than 1470 °C, which would lead to a decrease in the density and Q × f of the ceramics. The temperature coefficient of resonant frequency increases with increasing (Ca0.8Sr0.2)TiO3 content and tunes through near zero at x = 0.3. Specimen using 0.7Ca(Mg1/3Nb2/3)O3-0.3(Ca0.8Sr0.2)TiO3 possesses an excellent combination of microwave dielectric properties: εr ∼ 43.75, Q × f ∼ 45,200 GHz (where f = 6.3 GHz is the resonant frequency) and τf ∼ -4.2 ppm/°C. It is proposed as a suitable candidate material for small-sized GPS patch antennas.

AB - The crystal structures, phase compositions and the microwave dielectric properties of the (1-x)Ca(Mg1/3Nb2/3)O3-x(Ca0.8Sr0.2)TiO3 perovskite-based composites prepared by the conventional solid state route have been investigated. The formation of solid solution is confirmed by the XRD patterns. A rapid grain growth is observed at temperatures higher than 1470 °C, which would lead to a decrease in the density and Q × f of the ceramics. The temperature coefficient of resonant frequency increases with increasing (Ca0.8Sr0.2)TiO3 content and tunes through near zero at x = 0.3. Specimen using 0.7Ca(Mg1/3Nb2/3)O3-0.3(Ca0.8Sr0.2)TiO3 possesses an excellent combination of microwave dielectric properties: εr ∼ 43.75, Q × f ∼ 45,200 GHz (where f = 6.3 GHz is the resonant frequency) and τf ∼ -4.2 ppm/°C. It is proposed as a suitable candidate material for small-sized GPS patch antennas.

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Characterization and dielectric behavior of a new dielectric ceramics Ca(Mg_1/3Nb_2/3)O₃-(Ca_0.8Sr_0.2)TiO₃ at microwave frequencies

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