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- W2950151054 abstract "The crystal structures for a suite of substituted pollucites with the compositions CsTi x Al 1-x Si 2 O 6+0.5x , 0 ≤ x ≤ 1, have been determined from Rietveld analysis of powder synchrotron XRD data. Our results indicate that the pollucite end member (CsAlSi 2 O 6 ) has a tetragonal structure (space group I4 1 /a), whereas all other compositions are cubic (space group la3d). The increased symmetry for the titanium-substituted structures is presumably due to the incorporation of additional O 2- anions (needed for compensating the charge imbalance between Ti 4+ and Al 3+ ), which effectively holds open the expanded cubic framework. In situ cooling experiments of the substituted phase CsTi 0.1 Al 0.9 Si 2 O 6.05 reveal a displacive transformation to the tetragonal structure at ∼230 K. This transformation is tricritical in nature and is analogous to the tetragonal-to-cubic transition in pollucite on heating." @default.
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- W2950151054 date "2010-05-20" @default.
- W2950151054 modified "2023-09-24" @default.
- W2950151054 title "Crystal Chemistry and Phase Transitions in Substituted Pollucites Along the CsAlSi2O6-CsTiSi2O6.5 Join: A Powder Synchrotron X-Ray Diffractometry Study." @default.
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- W2950151054 doi "https://doi.org/10.1002/chin.200235016" @default.
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