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

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17 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

All Science Journal Classification (ASJC) codes

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

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