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Synthesis and Microwave Dielectric Properties of SrLa4−x Pr x Ti5O17 (0 ≤ x ≤ 4) Ceramics

Abstract

Single-phase ceramics in the SrLa4−x Pr x La4Ti5O17 (0 ≤ x ≤ 4) series were processed via a solid-state sintering route. X-ray diffraction analysis revealed single-phase ceramics for all the compositions. The molar volume (V m) decreased while the theoretical density (ρ th) increased with increase in the Pr content. Substitution of Pr3+ decreased the relative permittivity (ε r) and temperature coefficient of resonant frequency (τ f) due to its smaller ionic polarizability (α d) and ionic radius than La3+. In the present study, ε r ≈ 54.2, Q u f 0  ≈ 7935 GHz, and τ f  ≈ −20.3 ppm/°C were achieved for the composition with x = 2 (i.e., SrLa2Pr2Ti5O17).

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Acknowledgements

The authors acknowledge the financial support of the Directorate of Science and Technology (DOST) KPK Pakistan and electro-ceramics group in assisting the authors at the Electro-ceramics and Composite Laboratory, Department of Materials Science and Engineering, University of Sheffield (UK).

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Correspondence to Abdul Manan.

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Manan, A., Qazi, I. & Khan, U.S. Synthesis and Microwave Dielectric Properties of SrLa4−x Pr x Ti5O17 (0 ≤ x ≤ 4) Ceramics. J. Electron. Mater. 43, 1419–1423 (2014). https://doi.org/10.1007/s11664-014-3069-6

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  • DOI: https://doi.org/10.1007/s11664-014-3069-6

Keywords

  • Patch antenna
  • phase
  • permittivity
  • ceramic