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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Chao ECT, Fahey JJ, Littler J, Milton EJ (1962) Stishovite, SiO2, a very high pressure new mineral from Meteor Crater, Arizona. J Geophys Res 67:419–421
Finger LW (1972) A Fortran IV computer program for structure factor calculation and least-squares refinement of crystal structures. Geophys Lab Carnegie Inst Washington
Hill RJ, Newton MD, Gibbs GV (1983) A crystal chemical study of stishovite. J Solid State Chem 47:185–200
Ibers JA, Hamilton WC (eds) (1974) International Tables for X-Ray Crystallography IV, Kynoch, Birmingham
Ito H, Kawada K, Akimoto S (1974) Thermal expansion of stishovite. Phys Earth Planet Inter 8:277–281
Johnson CK (1965) ORTEP. Report ORNL-3794. Oak Ridge National Laboratory, Tennessee
Nakamura T (1982) Development of new materials under high pressure: single crystal growth of coesite (Japanese). Thesis Master of Sci. University of Tsukuba
gawa Y, Nunogaki K, Endo S, Kiritani M, Fujita FE (1981) Crystallization of amorphous Fe-B alloys under pressure. Proc 4th Int Conf Rapidly Quenched Metals, Sendai (The Japan Institute of Metals, 1982) Vol 1:675–678
Ogawa Y, Endo S, Kiritani M, Fujita FE, Fukizawa A (1984) Effect of pressure on the crystallization of amorphous Fe-B alloys. Jpn J Appl Phys 23:142–145
Pistorius CWFT (1975) Phase behavior of Li2WO4 at high pressures and temperatures. J Solid State Chem 13:325–329
Seki H, Ishizawa N, Mizutani N, Kato M (1984) High temperature structures of the rutile-type oxides, TiO2 and SnO2. J Ceramic Soc Jpn 92:219–223 (in Japanese)
Sinclair W, Ringwood AE (1978) Single crystal analysis of the structure of stishovite. Nature 272:714
Skinner BJ, Fahey JJ (1963) Observations on the inversion of stishovite to silica glass. J Geophys Res 68:5595–5604
Stishov SM, Popova SW (1961) A new modification of silica. Geokhimiya no 10:837–839 (English translation, Geochemistry no 10:923–926)
Whittaker EJW, Muntus R (1970) Ionic radii for use in geochemistry. Geochem Cosmochim Acta 34:945–956
Yagi T, Akimoto S (1976) Direct determination of coesite-stishovite transition by in-situ x-ray measurements. Tectonophysics 35:259–270
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
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
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00308155