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Phase, microstructure and microwave dielectric properties of Zr-doped SrLa4Ti5−xZrxO17

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Abstract

The effect of Zr+4 substitution for Ti+4 on the phase, microstructure and microwave dielectric properties of compositions in the SrLa4Ti5−xZrxO17 (0 ≤ x ≤ 0.1) series was investigated. All the compositions formed single phase ceramics within the detection limit of in-house X-ray diffractometer when sintered in the temperature range 1,450–1,580 °C for 4 h in air. The substitution of Zr+4 for Ti+4 enabled processing of highly dense ceramics with a decrease in temperature coefficient of resonant frequency (τf) from ~117 to 70 ppm/°C, dielectric constant (εr) from 60.8 to 57.3, with no significant effect on the quality factor. In the present study, optimum properties i.e. εr ~ 57.3, τf ~ 70 ppm/°C and quality factor (Q u  × f o ) ~ 9,841 GHz, were achieved for SrLa4Ti4.9Zr0.1O17. The trend of the results demonstrates that further studies with increased Zr+4 content are required to achieve ultra low loss SrLa4Ti5−xZrxO17 ceramics.

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Acknowledgments

The authors acknowledge the financial support of the Higher Education Commission of Pakistan (NRPU 20-569, IRSIP and Development of Materials Connection Centre, Pak-US Project ID 131) and electroceramics group in facilitating the authors at the Department of Material Science & Engineering Materials, University of Sheffield (UK).

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Authors and Affiliations

  1. Materials Research Laboratory, Institute of Physics and Electronics, University of Peshawar, Khyber Pukhtunkhwa, 25120, Pakistan

    Yaseen Iqbal & Abdul Manan

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  1. Yaseen Iqbal
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  2. Abdul Manan
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Correspondence to Yaseen Iqbal.

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Iqbal, Y., Manan, A. Phase, microstructure and microwave dielectric properties of Zr-doped SrLa4Ti5−xZrxO17 . J Mater Sci: Mater Electron 23, 536–541 (2012). https://doi.org/10.1007/s10854-011-0432-8

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  • DOI: https://doi.org/10.1007/s10854-011-0432-8

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