• Relative thermodynamic stabilities of constituent oxides of highTc superconductors

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    • Keywords

       

      Gibb’s free-energy of formation; vapour pressure; equilibrium oxygen pressure; thermodynamic stability

    • Abstract

       

      A thermodynamic scale of the relative stabilities of constituent oxides can help the choice of stoichiometric multi-component compositions and can provide guidance for judicious selection of heat-treatment conditions for high-Tc superconductors. A thermodynamic analysis was undertaken to study Y2O3-BaO-CuO, BaO-K2O-Bi2O3 and La2O3-SrO-NiO systems. The relative stability of the oxides was expressed in terms of two ratios,Sv andSp computed using free-energy of formation and vapour pressure data. CuO, Bi2O3 and NiO were taken as reference oxides for YBa2Cu3O7\t-\gd, Ba0·6K0·4BiO3 and La1·9Sr0·1NiO4 respectively. Thermodynamically, the reference oxide was found to be the least stable amongst the constituent oxides in each of these systems.

    • Author Affiliations

       

      SK Sundaram1 2

      1. Tata Research Development and Design Centre, 1, Mangaldas Road, Pune - 411 001, India
      2. New York State College of Ceramics, Alfred University, Alfred, New York - 14802, USA
    • Dates

       
  • Bulletin of Materials Science | News

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