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    • Keywords


      Cellular structure; subgrain boundaries; polygonalisation; frank net; optical twinning; synthetic quartz; alpha-quartz

    • Abstract


      Surfaces of optically flawless and untwinned quartz single crystals, both natural and synthetic, were dissolved both at room temperature and at high temperatures in autoclaves using appropriate etchants. The features that develop have been optically studied, and x-ray transmission projection topographs of some of the specimens from the same natural quartz were also taken and studied. A model has been proposed to explain the anomalies detected earlier by other workers regarding the nature of line defects found in as-grown synthetic quartz, and the absence of lateral strain in the polygonised microcracked layer of the specimens of the present series of experiments.

    • Author Affiliations


      Prasenjit Saha1 Tarun Bandyopadhyay1

      1. Central Glass and Ceramic Research Institute, Jadavpur, Calcutta - 700 032, India
    • Dates

  • Bulletin of Materials Science | News

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      Posted on July 25, 2019

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