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- W1966312332 abstract "Abstract The elastic and structural behaviour of dehydrated analcime in compression in a non-penetrating medium up to 3 GPa was studied in a diamond anvil cell using in situ synchrotron powder diffraction. A first-order phase transition at 0.4–0.7 GPa is accompanied by a symmetry change from monoclinic ( I 2/ a ) to pseudo-rhombohedral ( R 3) due to trigonalization of the aluminosilicate framework. This is due to the migration of cations to new positions close to the 6-membered rings forming the channels. The reduction of the mean aperture of the structure-forming 6- and 8-membered rings, as a result of tetrahedral tilting, leads to a 7.5% reduction in volume at the phase transition. The bulk modulus values are 38(2) GPa for the low pressure ( LP ) phase [fitted with a Murnaghan equation of state, K ' = 4 (fixed)] and 11(4) GPa for the high pressure (H P ) phase [fitted with a third-order Birch–Murnaghan equation of state, K ' = 9(1)]. The elastic behaviour of the L P phase is anisotropic, with compressibilities β a :β b :β c in the ratio 1:4:2; the most compressible direction b coinciding with the orientation of empty 8-membered rings. The compressibility of the HP phase is isotropic. Trigonalization appears to be the most effective (and probably unique) mechanism of radical volume contraction for the ANA structure type." @default.
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- W1966312332 date "2012-02-01" @default.
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- W1966312332 title "The deformation mechanism of a pressure-induced phase transition in dehydrated analcime" @default.
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- W1966312332 doi "https://doi.org/10.1180/minmag.2012.076.1.129" @default.
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