Phase transitions induced by solid solution in stuffed derivatives of quartz: A powder synchrotron XRD study of the LiAlSiO4-SiO2 join

H. Xu, P. J. Heaney, G. H. Beall

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30 Scopus citations

Abstract

The crystal structures of stuffed derivatives of quartz within the Li(1-x)Al(1-x)Si(1+x)O4 system have been refined by Rietveld analysis of powder synchrotron X-ray diffraction (XRD) data. Our results reveal an Al-Si order-disorder transition at x = ~0.3 and a β-α displacive transformation at x = ~0.65. Structural variations across the series result from an interplay of three mechanisms: tetrahedral tilting associated with Al-Si order-disorder; Li positional disorder along structural channels parallel to c; and tetrahedral rotation related to the β-α transition. At both microscopic (local bonding) and macroscopic (spontaneous strain) scales, the substitution of Li+ and Al3+ for Si4+ closely mimics temperature in its effect on the quartz framework.

Original languageEnglish (US)
Pages (from-to)971-979
Number of pages9
JournalAmerican Mineralogist
Volume85
Issue number7-8
DOIs
StatePublished - Jan 1 2000

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

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