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- W2753668105 abstract "Abstract In situ atomic force microscopy (AFM) measurements were performed to probe surface precipitates that formed on the 101¯4 surface of calcite (CaCO3) single crystals following reaction with Mn2+-bearing aqueous solutions. Three-dimensional epitaxial islands were observed to precipitate and grow on the surfaces. In situ time-sequenced measurements demonstrated that the growth rates were commensurate with those obtained for epitaxial islands formed on calcite crystals reacted with Cd2+-bearing aqueous solutions of the same range in supersaturation with respect to the pure metal carbonate phase. This finding was unexpected as rhodochrosite (MnCO3) and calcite display a 10% lattice mismatch, based on the area of their 101¯4 surface unit cells, whereas the lattice mismatch is only 4% for otavite (CdCO3) and calcite. Coatings of varying thicknesses were therefore synthesized by reacting calcite single crystals in calcite-equilibrated aqueous solutions with up to 250 μM MnCl2. Ex situ X-ray photoelectron spectroscopy (XPS), scanning transmission electron microscopy (STEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), X-ray reflectivity (XRR), and AFM measurements of the reacted crystals demonstrated the formation of an epitaxial (Mn,Ca)CO3 solid solution. The epitaxial solid solution had a spatially complex composition, whereby the first few nanometers were rich in Ca and the Mn content increased with distance from the original calcite surface, culminating in a topmost region of almost pure MnCO3 for the thickest coatings. The effective lattice mismatch was therefore much smaller than the nominal mismatch thus explaining the measured growth rates. These findings highlight the strong influence played by the substrate on the composition of surface precipitates in aqueous conditions." @default.
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- W2753668105 date "2017-10-01" @default.
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- W2753668105 title "Manganese-calcium intermixing facilitates heteroepitaxial growth at the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si3.gif overflow=scroll><mml:mfenced open=( close=)><mml:mrow><mml:mn>10</mml:mn><mml:mover accent=false><mml:mn>1</mml:mn><mml:mo>¯</mml:mo></mml:mover><mml:mn>4</mml:mn></mml:mrow></mml:mfenced></mml:math> calcite-water interface" @default.
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- W2753668105 doi "https://doi.org/10.1016/j.chemgeo.2017.09.001" @default.
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