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      https://www.ias.ac.in/article/fulltext/boms/003/01/0001-0008

    • Keywords

       

      Dielectrics; ceramics; phase transformation; barium titanate

    • Abstract

       

      Some new potential dielectric materials have been made through the cross-substitution of Ba2+ by a 1:1 molar combinations of tri-(La3+) and mono-valent (Li+, Na+, K+) ions at the Ba2+ site in BaTiO3. Chemical analysis shows that compositions in the potassium series are about 6·1% deficient in their K2O content and exhibit interesting dielectric relaxations. The cross-substitution has lowered theTc down to room temperature. The disorder in the larger ‘A’ cation sublattice of the three systems has been established by infra-red and x-ray data. This leads to microscopic compositional variations, which in turn can account for the diffuseness of the dielectric anomalies observed in the barium titanate-rich compositions (0⩽x⩽0·3).

    • Author Affiliations

       

      A M Varaprasad1 2 D K Chakrabarty1 A B Biswas1

      1. Solid State Laboratory, Chemistry Department, Indian Institute of Technology, Bombay - 400 076, India
      2. Hindustan Lever Research Centre, Bombay - 400 093, India
    • Dates

       
  • Bulletin of Materials Science | News

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