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      https://www.ias.ac.in/article/fulltext/boms/035/03/0387-0394

    • Keywords

       

      Electronic materials; Raman spectroscopy; dielectric properties; microstructure.

    • Abstract

       

      Various fluxing materials are added to technical ceramics in an attempt to lower their sintering temperatures and make their processing economical. The effect of 0.3wt%Li2CO3 addition on the phase, microstructure, phase transition temperatures and dielectric properties of BaTiO3 was investigated in the present study. The addition of 0.3wt% Li2CO3 was observed to lower the optimum sintering temperature by ∼200°C with no second phase formation and cause a five-fold reduction in grain size. Rhombohedral-to-orthorhombic and tetragonal-to-cubic phase transitions at the expected temperatures were evident from the Raman spectra, but the orthorhombic-totetragonal phase transition was not clearly discernible. The persistence of various phase(s) at higher temperatures in the flux-added materials indicated that the phase transitions occurred relatively slowly. A decrease in dielectric constant of Li2O-added BaTiO3 in comparison to pure BaTiO3 may be due to the diminished dielectric polarizability of Li+ in comparison to Ba2+.

    • Author Affiliations

       

      Yaseen Iqbal1 Asad Jamal1 Riaz Ullah1 M Naeem Khan1 Rick Ubic2

      1. Materials Research Laboratory, Institute of Physics & Electronics, University of Peshawar, Peshawar 25120, Pakistan
      2. College of Engineering, Boise State University, Idaho, USA
    • Dates

       
  • Bulletin of Materials Science | News

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      Posted on July 25, 2019

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