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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/030/04/0333-0338

    • Keywords

       

      Microwave materials; ceramic dielectric resonators; polytitanates; co-precipitation.

    • Abstract

       

      The present study focuses on critical factors limiting single-phase formation of Ba2Ti9O20 (2 : 9). Apart from 2 : 9, other polytitanates that are richer in Ti or Ba could also be prepared as single-phase material without any stabilizing agent through chemical co-precipitation. 2 : 9 is found to be a stoichiometric compound and even 0.5% excess Ti or Ba leads to multiphase formation. Single-phase 2 : 9 could be achieved even through solid-state route without the addition of stabilizing agents using high purity raw materials. The present results do not agree with existing hypotheses viz. diffusion, high surface and nucleation energy, potential barrier, non-stoichiometry etc as critical factors limiting formation of 2 : 9 as single-phase material.

    • Author Affiliations

       

      Unnikrishnan Gopinath1 Dhanya Chandran1 Seema Ansari1 Bindu Krishnan1 Rani Panicker1 Raghu Natarajan1

      1. Centre for Materials for Electronics Technology, Thrissur 680 771, India
    • Dates

       

© 2017 Indian Academy of Sciences, Bengaluru.