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- W1551996857 abstract "Abstract The elastic behaviour and the pressure ( P ) induced structural evolution of Na 6 Cs 2 Ga 6 Ge 6 O 24 · Ge(OH) 6 , a synthetic compound isotypic with cancrinite (CAN topology), have been investigated up to 5.01(5) GPa by means of in situ X-ray synchrotron powder diffraction with a diamond anvil cell and using a nominally penetrating hydrous P -transmitting medium (methanol:ethanol:water = 16:3:1). No evidence of phase-transition was observed within the P -range investigated. The P – V data were fitted with a Murnaghan equation-of-state (M-EoS). The elastic parameters obtained, using the data weighted by the uncertainties in P – V , are: V 0 = 757.16(7) A 3 , K T0 = 36(2) GPa [ K T0 = 1/ β = − V 0 (∂ P /∂ V ) P =0 , where β is the volume compressibility coefficient] and K ′ = (∂ K T0 /∂ P ) = 9(1). The elastic behaviour along the a and c axis was described with a “linearised” M-EoS. The refined parameters of the linearised M-EoS are: a 0 = 13.0314(4) A, K T0 ( a ) = 40(2) [ β j = −1/(3 K T0 ( j )) = (1/ l 0 j )(∂ l j /∂ P ), where β j is the axial compressibility coefficient] and K ′( a ) = 11(1) for the a -axis; c 0 = 5.1485(4) A, K T0 ( c ) = 31(1) GPa and K ′( c ) = 7.4(8) for the c -axis. The elastic anisotropy of Na 6 Cs 2 Ga 6 Ge 6 O 24 · Ge(OH) 6 is only marginal, being K T0 ( a ): K T0 ( c ) = 1.29:1. The configuration of the extra-framework content is basically maintained at high-pressure, without any major changes. The Ge(OH) 6 -polyhedron is strongly compressed in response to the applied pressure, but there is no evidence of further deformation. On the other hand the Na(O 3 OH 3 )-polyhedron and the large Cs-polyhedron appear to be compressed in a way to lessen the deformation with increasing pressures. Despite the use of a hydrous P -transmitting fluid for the H P -experiment and the large “free-diameters” of the channels in CAN framework, no evidence of superhydration effect was observed within the P -range investigated." @default.
- W1551996857 created "2016-06-24" @default.
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- W1551996857 date "2008-12-01" @default.
- W1551996857 modified "2023-09-23" @default.
- W1551996857 title "Pressure-induced structural evolution and elastic behaviour of Na6Cs2Ga6Ge6O24·Ge(OH)6 variant of cancrinite: A synchrotron powder diffraction study" @default.
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- W1551996857 doi "https://doi.org/10.1016/j.micromeso.2008.03.010" @default.
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