Structural characteristics and microwave dielectric properties of low-firing Ba(Co1-xMgx)2(VO4)2 (x = 0-1) ceramics

Chia Hui Su, Feng Cheng Lin, Tsung Min Chu, Cheng-Liang Huang

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The effects of the substitution of Mg2+ at Co2+ sites on the structural, optical and microwave dielectric properties of Ba(Co1-xMgx)2(VO4)2 (x = 0-1) ceramics were investigated. All these compositions were prepared by a conventional solid-state reaction method and observed to crystallize in a tetragonal structure, as confirmed by the XRD diffraction patterns. The unit cell volume decreased with the addition of Mg, due to the smaller ionic radius of Mg2+ than Co2+. The relationships between the polarizability, packing fraction, and bond valence with the microwave dielectric properties are also discussed. The specimen Ba(Co0.2Mg0.8)2(VO4)2 ceramic sintered at 870 °C for 4 h has a dielectric constant (ϵr) of ∼12.28, a Q × f of ∼88,700 GHz (f = 11.469 GHz), and a τf ∼ - 40.6 ppm/°C, and thus is a suitable candidate for use in microwave applications.

Original languageEnglish
Pages (from-to)608-615
Number of pages8
JournalJournal of Alloys and Compounds
Volume686
DOIs
Publication statusPublished - 2016 Nov 25

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Dielectric properties
Microwaves
Solid state reactions
Diffraction patterns
Permittivity
Substitution reactions
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

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title = "Structural characteristics and microwave dielectric properties of low-firing Ba(Co1-xMgx)2(VO4)2 (x = 0-1) ceramics",
abstract = "The effects of the substitution of Mg2+ at Co2+ sites on the structural, optical and microwave dielectric properties of Ba(Co1-xMgx)2(VO4)2 (x = 0-1) ceramics were investigated. All these compositions were prepared by a conventional solid-state reaction method and observed to crystallize in a tetragonal structure, as confirmed by the XRD diffraction patterns. The unit cell volume decreased with the addition of Mg, due to the smaller ionic radius of Mg2+ than Co2+. The relationships between the polarizability, packing fraction, and bond valence with the microwave dielectric properties are also discussed. The specimen Ba(Co0.2Mg0.8)2(VO4)2 ceramic sintered at 870 °C for 4 h has a dielectric constant (ϵr) of ∼12.28, a Q × f of ∼88,700 GHz (f = 11.469 GHz), and a τf ∼ - 40.6 ppm/°C, and thus is a suitable candidate for use in microwave applications.",
author = "Su, {Chia Hui} and Lin, {Feng Cheng} and Chu, {Tsung Min} and Cheng-Liang Huang",
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Structural characteristics and microwave dielectric properties of low-firing Ba(Co1-xMgx)2(VO4)2 (x = 0-1) ceramics. / Su, Chia Hui; Lin, Feng Cheng; Chu, Tsung Min; Huang, Cheng-Liang.

In: Journal of Alloys and Compounds, Vol. 686, 25.11.2016, p. 608-615.

Research output: Contribution to journalArticle

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AU - Huang, Cheng-Liang

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N2 - The effects of the substitution of Mg2+ at Co2+ sites on the structural, optical and microwave dielectric properties of Ba(Co1-xMgx)2(VO4)2 (x = 0-1) ceramics were investigated. All these compositions were prepared by a conventional solid-state reaction method and observed to crystallize in a tetragonal structure, as confirmed by the XRD diffraction patterns. The unit cell volume decreased with the addition of Mg, due to the smaller ionic radius of Mg2+ than Co2+. The relationships between the polarizability, packing fraction, and bond valence with the microwave dielectric properties are also discussed. The specimen Ba(Co0.2Mg0.8)2(VO4)2 ceramic sintered at 870 °C for 4 h has a dielectric constant (ϵr) of ∼12.28, a Q × f of ∼88,700 GHz (f = 11.469 GHz), and a τf ∼ - 40.6 ppm/°C, and thus is a suitable candidate for use in microwave applications.

AB - The effects of the substitution of Mg2+ at Co2+ sites on the structural, optical and microwave dielectric properties of Ba(Co1-xMgx)2(VO4)2 (x = 0-1) ceramics were investigated. All these compositions were prepared by a conventional solid-state reaction method and observed to crystallize in a tetragonal structure, as confirmed by the XRD diffraction patterns. The unit cell volume decreased with the addition of Mg, due to the smaller ionic radius of Mg2+ than Co2+. The relationships between the polarizability, packing fraction, and bond valence with the microwave dielectric properties are also discussed. The specimen Ba(Co0.2Mg0.8)2(VO4)2 ceramic sintered at 870 °C for 4 h has a dielectric constant (ϵr) of ∼12.28, a Q × f of ∼88,700 GHz (f = 11.469 GHz), and a τf ∼ - 40.6 ppm/°C, and thus is a suitable candidate for use in microwave applications.

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