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      https://www.ias.ac.in/article/fulltext/boms/025/03/0191-0196

    • Keywords

       

      Low-thermal expansion; thermal expansion hysteresis; NZP ceramics.

    • Abstract

       

      The low thermal expansion ceramic system, Ca1-𝑥Sr𝑥Zr4P6O24, for the compositions with 𝑥 = 0, 0.25, 0.50, 0.75 and 1 was synthesized by solid-state reaction. The sintering characteristics were ascertained by bulk density measurements. The fracture surface microstructure examined by scanning electron microscopy showed the average grain size of 2.47 𝜇m for all the compositions. The thermal expansion data for these ceramic systems over the temperature range 25–800°C is reported. The sinterability of various solid solutions and the hysteresis in dilatometric behaviour are shown to be related to the crystallographic thermal expansion anisotropy. A steady increase in the amount of porosity and critical grain size with increase in 𝑥 is suggested to explain the observed decrease in the hysteresis.

    • Author Affiliations

       

      Basavaraj Angadi1 V M Jali1 M T Lagare1 N S Kini2 A M Umarji2

      1. Department of Physics, Gulbarga University, Gulbarga 585 106, India
      2. Materials Research Centre, Indian Institute of Science, Bangalore 560 012, India
    • Dates

       
  • Bulletin of Materials Science | News

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