Abstract
Single crystal stishovite with a square prismatic habit and maximum length 0.8 mm was grown from α-quartz at 120 kbar and ∼1,300° C. Li2WO4, chosen as a result of a previous experiment in growing coesite, was also successful as flux for stishovite. Single crystal X-ray structure analysis of the crystals thus obtained has been carried out at high temperatures under ambient pressure. Lattice constant measurements give a larger thermal expansion coefficient along the a-axis than along the c-axis. The bond distances and bond angles show a decreasing distortion of the SiO6 octahedron with increasing temperature. The increasing amplitude of thermal vibrations of oxygen atoms with increasing temperature results in increasing O-O repulsion in the basal plane, which explains the observed crystallographic changes.
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Endo, S., Akai, T., Akahama, Y. et al. High temperature X-ray study of single crystal stishovite synthesized with Li2WO4 as flux. Phys Chem Minerals 13, 146–151 (1986). https://doi.org/10.1007/BF00308155
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DOI: https://doi.org/10.1007/BF00308155