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Glass-Free Zn2Te3O8 Microwave Ceramic for LTCC Applications

Authors

  • G. Subodh,

    1. Materials and Minerals Division, Regional Research Laboratory, Trivandrum-695019, India
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  • M. T. Sebastian

    Corresponding author
    1. Materials and Minerals Division, Regional Research Laboratory, Trivandrum-695019, India
      †Author to whom correspondence should be addressed. e-mail: mailadils@yahoo.com
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  • C. Free—contributing editor

†Author to whom correspondence should be addressed. e-mail: mailadils@yahoo.com

Abstract

A Zn2Te3O8 ceramic was investigated as a promising dielectric material for low-temperature co-fired ceramics (LTCC) applications. The Zn2Te3O8 ceramic was synthesized using the solid-state reaction method by sintering in the temperature range 540°–600°C. The structure and microstructure of the compounds were investigated using X-ray diffraction (XRD) and scanning electron microscopy methods. The dielectric properties of the ceramics were studied in the frequency range 4–6 GHz. The Zn2Te3O8 ceramic has a dielectric constant (ɛr) of 16.2, a quality factor (Qu×f) of 66 000 at 4.97 GHz, and a temperature coefficient of resonant frequency (τf) of −60 ppm/°C, respectively. Addition of 4 wt% TiO2 improved the τf to −8.7 ppm/°C with an ɛr of 19.3 and a Qu×f of 27 000 at 5.14 GHz when sintered at 650°C. The chemical reactivity of the Zn2Te3O8 ceramic with Ag and Al metal electrodes was also investigated.

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