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Zeitschrift für Kristallographie - Crystalline Materials

Editor-in-Chief: Pöttgen, Rainer

Ed. by Antipov, Evgeny / Boldyreva, Elena V. / Friese, Karen / Huppertz, Hubert / Jahn, Sandro / Tiekink, E. R. T.

IMPACT FACTOR 2018: 1.090
5-year IMPACT FACTOR: 2.159

CiteScore 2018: 1.47

SCImago Journal Rank (SJR) 2018: 0.892
Source Normalized Impact per Paper (SNIP) 2018: 0.722

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Volume 177, Issue 1-2


Structural change of orthorhombic-I tridymite with temperature: A study based on second-order thermal-vibrational parameters

Kuniaki Kihara / Takeo Matsumoto / Moritaka Imamura
Published Online: 2010-08-25 | DOI: https://doi.org/10.1524/zkri.1986.177.1-2.27


X-ray studies of orthorhombic-I tridymite, especially focussed on atomic mean-square displacements (m.s.d.'s) at 443, 493, 573, 653 and 693 K respectively, were carried out on the basis of the usual second-order refinement of the Dollase model.

The m.s.d.'s for O are highly anisotropic, and large in the planes perpendicular to Si – Si axes. Plots of temperature vs. m.s.d.'s point to a disorder of O atoms in the orthorhombic-I form. The transition, from the orthorhombic-I to the hexagonal high form or vice versa, is an example of a displacive structure transition from a disordered structure to another disordered one. When temperature falls from 693 K, any two SiO4 tetrahedra joined by O on the two-fold axes parallel to a move away from the hexagonal positions, rotating progressively around the two-fold axes, and then symmetry is lowered to orthorhombic. The pair-wise rotations are accompanied by anisotropic changes of the thermal ellipsoids for two kinds of O atoms forming the basal planes of silica tetrahedra, nearly normal to c; the thermal ellipsoids are distorted to elliptical shapes in the sections perpendicular to Si – Si axes when temperature falls. On the other hand, the thermal ellipsoid for the apical O atom is approximately circular in that section.

About the article

Published Online: 2010-08-25

Published in Print: 1986-01-01

Citation Information: Zeitschrift für Kristallographie - Crystalline Materials, Volume 177, Issue 1-2, Pages 27–38, ISSN (Online) 2196-7105, ISSN (Print) 0044-2968, DOI: https://doi.org/10.1524/zkri.1986.177.1-2.27.

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