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

doi:10.1016/j.jallcom.2016.06.062

Structural characteristics and microwave dielectric properties of low-firing Ba(Co_1-xMg_x)₂(VO₄)₂ (x = 0-1) ceramics

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

電機工程學系

研究成果: Article › 同行評審

16 引文斯高帕斯（Scopus）

摘要

The effects of the substitution of Mg²⁺ at Co²⁺ sites on the structural, optical and microwave dielectric properties of Ba(Co_1-xMg_x)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(Co_0.2Mg_0.8)₂(VO₄)₂ ceramic sintered at 870 °C for 4 h has a dielectric constant (ϵ_r) of ∼12.28, a Q × f of ∼88,700 GHz (f = 11.469 GHz), and a τ_f ∼ - 40.6 ppm/°C, and thus is a suitable candidate for use in microwave applications.

原文	English
頁（從 - 到）	608-615
頁數	8
期刊	Journal of Alloys and Compounds
卷	686
DOIs	https://doi.org/10.1016/j.jallcom.2016.06.062
出版狀態	Published - 2016 十一月 25

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2016.06.062

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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 Huang, {Cheng Liang}",

note = "Funding Information: This work was financially supported by the Ministry of Science and Technology, Taiwan under grant MOST 104-2221-E-006-037 .",

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AU - Lin, Feng Cheng

AU - Chu, Tsung Min

AU - Huang, Cheng Liang

N1 - Funding Information: This work was financially supported by the Ministry of Science and Technology, Taiwan under grant MOST 104-2221-E-006-037 .

PY - 2016/11/25

Y1 - 2016/11/25

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.

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