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- W1995078889 abstract "MgO–SiO2 precursor gels were prepared by mixing tetramethoxysilane (TMOS) or tetraethoxysilane (TEOS), H2O, and magnesium metal in methanol. Forsterite (Mg2SiO4) and orthoenstatite (MgSiO3) were crystallized from their precursors at temperatures as low as 500° and 700°C, respectively. The chemical compositions of the crystallized phases were richer in MgO content than those of the starting materials. Inductively coupled plasma analysis showed that an amorphous SiO2-rich phase was present, together with crystalline phases. We speculate that the amorphous SiO2-rich phase has an important role in the low-temperature crystallizations of these magnesium silicates. Characterization of the preparation process via liquid-state 29Si nuclear magnetic resonance (NMR) indicated that the breakage of the ≡Si–O–Si≡ bond was caused by the addition of magnesium metal. Solid-state 29Si NMR showed that the Mg–O–Si bond might form in as-prepared specimens." @default.
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- W1995078889 date "2004-12-22" @default.
- W1995078889 modified "2023-10-17" @default.
- W1995078889 title "Low-Temperature Crystallization of Forsterite and Orthoenstatite" @default.
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- W1995078889 doi "https://doi.org/10.1111/j.1151-2916.1999.tb01718.x" @default.
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