The solid lines represent the measured spectrum. The Mg 2p peak at 52.1 eV and the O 1s peak at 533.5 eV stem from MgCO 3, the O 1s peak at 531.0 eV from MgO and the O 1s peak at 535.6 eV from surface adsorbed water. The three visible absorption bands (1440 cm −1, 1100 cm −1 and 850 cm −1) are all due to vibrations of the CO 3 group. The band observed at ∼1100 cm −1 stems from vibration of the CO 3 group and the halo cantered at 100 cm −1 is a Boson peak. The halo at 2 θ∼30° indicates the presence of at least one amorphous phase and the sharp peaks at higher scattering angles pertain to crystalline MgO. Characterisation of as-synthesised Upsalite and schematic description of the synthesis steps.Ī) XRD pattern.
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