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Structure and microwave dielectric properties of La5−x Sr x Ti4+x Ga1−x O17 ceramics

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Abstract

Single phase polycrystalline ceramics in the La5−x Sr x Ti4+x Ga1−x O17 (x = 0–1) system with A5B5O17 type layered perovskite structure were prepared via a mixed-oxide, solid state sintering route. X-ray diffraction revealed orthorhombic, Pnnm symmetry with Raman spectra consistent with this space group. The sintered ceramics exhibited a plate-like grain structure with a relative density, 94–97.5 %. The end member, La5Ti4GaO17 had ε r = 42.31, Q × f o = 17,093 GHz, τ f = −34.53 but τ f could be tuned close to zero by Sr and Ti substitution at the A- and B-sites, respectively. An optimum composition La4.5Sr0.5Ti4.5Ga0.5O17 was achieved at x = 0.5 with ε r = 51, Q × f o = 15,290 GHz and τ f = −2.2 ppm/oC.

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Acknowledgements

The authors acknowledge the financial support of the Higher Education Commission of Pakistan under the IRSIP program. The financial support extended by the Khyber Pakhtunkhwa Government through the Directorate of S&T, Peshawar for the upgradation of Materials Research Laboratory, University of Peshawar is highly acknowledged.

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Authors and Affiliations

  1. Materials Research Laboratory, Department of Physics, University of Peshawar, Peshawar, 25120, Pakistan

    Raz Muhammad & Yaseen Iqbal

  2. Department of Materials Science and Engineering, University of Sheffield, Sheffield, S1 3JD, UK

    Ian M. Reaney

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  1. Raz Muhammad
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  2. Yaseen Iqbal
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  3. Ian M. Reaney
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Correspondence to Yaseen Iqbal.

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Muhammad, R., Iqbal, Y. & Reaney, I.M. Structure and microwave dielectric properties of La5−x Sr x Ti4+x Ga1−x O17 ceramics. J Mater Sci 50, 3510–3516 (2015). https://doi.org/10.1007/s10853-015-8914-3

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  • DOI: https://doi.org/10.1007/s10853-015-8914-3

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