• Improvement in the microwave dielectric properties of SrCa4Nb4TiO17 ceramics by Ba substitution

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      https://www.ias.ac.in/article/fulltext/boms/037/06/1215-1219

    • Keywords

       

      XRD; processing; phase; ceramics.

    • Abstract

       

      Microwave dielectric ceramics in the Sr1–𝑥Ba𝑥Ca4Nb4TiO17 (0 ≤ 𝑥 ≤ 0.75) composition series were fabricated via a solid-state mixed oxide route. All the compositions formed single phase in Sr1–𝑥Ba𝑥Ca4Nb4TiO17 (0 ≤ 𝑥 ≤ 0.75) solid solutions within the detection limit of in-house X-ray diffraction (XRD). The sintered microstructure of these ceramics comprised densely packed elongated and plate-like grains. The dielectric properties varied linearly with 𝑥. Relative permittivity (𝜀r) increased from 47.2 to 54.5, unloaded quality factor multiplying the resonant frequency (𝑄u 𝑓o) decreased from 11,984 to 9345 GHz and temperature coefficient of resonant frequency (𝜏f) increased from –78.6 to 20 ppm/°C with an increase in x from 0 to 0.75. In the present study, 𝜀r ≈ 51.6, 𝑄u 𝑓o ≈ 10,160 GHz (5.37 GHz) and 𝜏f ≈ –13.5 ppm/°C were achieved for Sr0.5Ba0.5Ca4Nb4TiO17 (𝑥 = 0.5) ceramics.

    • Author Affiliations

       

      Abdul Manan1 Yaseen Iqbal2

      1. Department of Physics, University of Science and Technology, Bannu, 28100 KPK, Pakistan
      2. Materials Research Laboratory, Institute of Physics and Electronics, University of Peshawar, Peshawar 25120, KPK, Pakistan
    • Dates

       
  • Bulletin of Materials Science | News

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