• A theoretical consideration of the intermediate phase in α-βtransition of quartz

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      https://www.ias.ac.in/article/fulltext/jcsc/092/04-05/0429-0435

    • Keywords

       

      Phase transition theory; quartz

    • Abstract

       

      Recently, a thermodynamically stable phase between a (low) andΒ (high) phases of quartz has teen found. This paper explains the three phases by a statistical theory of Bragg-William’s type by assuming three states of SiO4 tetrahedron along a-axis. Adjusting the interaction parameters one can predict the successive transitions of the first-order (Tc) and the nearly second-order (TQ. Also with an assignment of Tc = 573‡C, one obtains TQ = Tc+ 1.2 degree which fits to the experiment. The difference in energy between Dauphiné twin bonding and the normal bonding is estimated to be 0.525 eV.

    • Author Affiliations

       

      N Kato1

      1. Department of Crystalline Materials Science, Faculty of Engineering, Nagoya University, Chikusa-ku, Nagoya, Japan
    • Dates

       
  • Journal of Chemical Sciences | News

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