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X-ray single-crystal structural characterization of Na2 MgSiO4 with cristobalite-type structure synthesised at 22 GPa and 1800°C

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Na2 MgSiO4 is a mineralogical phase known in the literature as N2MS and reported in several high-pressure experiments (13.6 < P<22 GPa) to coexist with wadsleyite, garnet and pyroxene. Although the crystal structure of room- PT Na2 MgSiO4 is known, a structural study of the phase recovered in high-pressure experiments has not been done yet. Here we present a chemical and structural study of a crystal of Na2 MgSiO4 synthesised in the model system Na2 MgSiO4 –Mg2 SiO4 at 22 GPa and 1800°C. The compound was found to crystallize with the orthorhombic cristobalite-type structure previously described at room conditions, space group Pna 21, with lattice parameters a = 10.8193(8), b = 5.2702(3), c = 7.0598(4) Å, V = 402.55(4) Å3, and Z = 4. The structure was refined to R 1 = 0.0184 using 644 observed reflections [F o >4 σ(F o)] and 73 parameters. The unit-cell of the phase studied here is nearly identical to that of Na2 MgSiO4 synthesised at room conditions, thus indicating that it likely relaxed during the pressure release occurring during quenching.
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Keywords: CRISTOBALITE-TYPE STRUCTURE; EARTH' S MANTLE; HIGH-PRESSURE EXPERIMENTS; SINGLE-CRYSTAL X-RAY DIFFRACTION; SODIUM-RICH PHASE; SYNTHESIS

Document Type: Research Article

Publication date: 01 June 2018

This article was made available online on 27 October 2017 as a Fast Track article with title: "X-ray single-crystal structural characterization of Na2MgSiO4 with cristobalite-type structure synthesised at 22 GPa and 1800 °C".

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  • The European Journal of Mineralogy publishes original papers, review articles and letters dealing with the mineralogical sciences s.l. These include primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, as well as environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.
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