Mg‐bearing quartz solid solutions as structural intermediates between low and high quartz

Glass powder samples of cordierite composition (doped with 8 mol% TiO2) were heat‐treated to produce a series of increasingly SiO2‐enriched Mg‐bearing quartz solid solutions (Qss). The obtained materials were then analyzed by X‐ray diffraction: Rietveld structural refinements revealed that Mg‐bearin...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2021-02, Vol.104 (2), p.1146-1155
Main Authors: Zandona, Alessio, Rüdinger, Bernd, Deubener, Joachim
Format: Article
Language:English
Subjects:
Composition
Cordierite
Crystals
Diffraction
glass‐ceramics
magnesium aluminosilicate
Quartz
quartz inversion
quartz solid solutions
Silica glass
Silicon dioxide
Solid solutions
Thermal expansion
Titanium dioxide
X‐ray diffraction
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Summary:Glass powder samples of cordierite composition (doped with 8 mol% TiO2) were heat‐treated to produce a series of increasingly SiO2‐enriched Mg‐bearing quartz solid solutions (Qss). The obtained materials were then analyzed by X‐ray diffraction: Rietveld structural refinements revealed that Mg‐bearing Qss phases possess trigonal symmetry and a compositionally dependent intermediate structural arrangement between those of low and high quartz. High‐temperature diffraction measurements were performed up to 700°C to characterize the thermal expansion behavior of the crystals. At SiO2‐rich compositions, a reversible high‐to‐intermediate inversion of the quartz structure is observed, which shifts with increasing stuffing to lower temperatures than the conventional 573°C for pure quartz. Similarities and differences to the better‐established Li‐bearing Qss are discussed in the text.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.17517