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Synthesis, characterization and dielectric properties of Ba1−x La x Ti1−x/4O3 powders and ceramics synthesized by sol–gel method

  • Asad Mahmood
  • Abdul Naeem
  • Yaseen Iqbal
  • Tahira Mahmood
  • Asad Ullah
Article

Abstract

In the present study polycrystalline Ba1−x La x Ti1−x/4O3 (x = 0.00, 0.015, 0.025, 0.035, 0.045 and 0.055) powders were synthesized using sol–gel route at 850 °C for 4 h. Calcined powders were sintered in air at 1300 °C for 6 h to make dense ceramics. XRD studies confirmed the tetragonal crystal structure of the x = 0.00–0.035 compositions at room temperature of the Ba1−x La x Ti1−x/4O3 ceramic samples. A cubic symmetry (Pm3m) was observed for the x > 0.035 compositions around room temperature. SEM studies showed that the average grain size was decreased with an increase in La content. The dielectric constant (ɛr) and dielectric loss (tan δ) of the Ba1−x La x Ti1−x/4O3 ceramics were investigated in the frequency regime (10 kHz–1 MHz). The highest magnitude of ɛr and tan δ around room temperature at 10 kHz was recorded for the x = 0.025 composition as 14,468 and 0.07, respectively. The Curie temperature (Tc) was shifted to low temperatures with an increase in La content. Complex impedance analysis confirmed the grain boundary and bulk contribution in the conduction mechanism for the x = 0.00 composition. The ≥ 0.015 compositions showed only grain boundary contributions. The total resistance of sintered samples was decreased with an increase in temperature for the Ba1−x La x Ti1−x/4O3 ceramics, showing a typical ceramic behavior.

Keywords

BaTiO3 Barium Titanate Boundary Contribution BaTiO3 Ceramic Bulk Contribution 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors acknowledge the financial support of Higher Education Commission of Pakistan under the 5000 Indigenous PhD Fellowship Program and International Research Support Initiative Program (IRSIP). The authors acknowledge the laboratory support extended by Prof. I. M. Reaney and his group, Electroceramic Laboratory, Department of Material Science and Engineering, University of Sheffield (UK).

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Asad Mahmood
    • 1
    • 2
    • 3
  • Abdul Naeem
    • 1
  • Yaseen Iqbal
    • 2
  • Tahira Mahmood
    • 1
  • Asad Ullah
    • 1
  1. 1.National Centre of Excellence in Physical ChemistryUniversity of PeshawarPeshawarPakistan
  2. 2.Materials Research Laboratory, Institute of Physics and ElectronicsUniversity of PeshawarPeshawarPakistan
  3. 3.Department of Engineering MaterialsUniversity of SheffieldSheffieldUK

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