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    • Role of some rare earth (RE) ions (RE = La, Pr, Nd, Sm, Gd and Dy) in crystal and mechanical behaviours of sol–gel derived ZrO2–2 mol% RE2O3 spun fibres calcined at 1300°C

      M K Naskar M Chatterjee D Ganguli

      Sol--gel Materials Volume 25 Issue 5 October 2002 pp 413-417

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/025/05/0413-0417

    • Keywords

       

      Rare earth; ionic size; crystallization temperature; phase transformation; lattice strain; tensile strength.

    • Abstract

       

      Crystal behaviours such as crystallization temperature (amorphous to tetragonal (𝑡) zirconia), tendency of phase transformation (tetragonal to monoclinic (𝑚) zirconia) and lattice strain were studied with mechanical property e.g. tensile strength of sol–gel derived ZrO2–2 mol% RE2O3 (RE = La, Pr, Nd, Sm, Gd and Dy) spun fibres. Rare earth cations of varying sizes played a significant role in changing the above mentioned properties of ZrO2–2 mol% RE2O3 fibres. It was found that with decreasing the ionic size difference between the zirconium and RE ions, crystallization temperature (amorphous $\rightarrow \ t$-ZrO2) decreased, the probability of phase transformation ($t \rightarrow m$) decreased, lattice strain which is related to lattice distortion decreased and tensile strength increased.

    • Author Affiliations

       

      M K Naskar1 M Chatterjee1 D Ganguli1 2

      1. Sol–Gel Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, India
      2. Department of Materials Science, Indian Association for the Cultivation of Science, Kolkata 700 032, India

    • Dates

       
      Published
      October 2002
      Manuscript received
      16 March 2002
      Manuscript revised
      27 June 2002

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