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CaCO3 (Calcite)/Li2CO3 (Zabuyelite) Anomalous Mixed Crystals. Sector Zoning and Growth Mechanisms
A growth model of {0001} form bearing calcite crystals has been proposed in our previous papers. A detailed PBC (periodic bond chains) study demonstrated that calcite {0001} form could not be stable, owing to its K character. The stabilization involves a 2D epitaxial growth mechanism between calcium and lithium carbonate, the model being supported by parametric fit between calcium and lithium carbonates. In this paper, we experimentally evaluate the consistency of this model. Integrated spectroscopic and imaging characterization techniques, inductively coupled plasma optical emission spectroscopy (ICP-OES), scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray powder diffraction (XRPD), cathodoluminescence (CL) and electron paramagnetic resonance (EPR) have been applied to synthetic calcite crystals grown in the presence of lithium in order to investigate whether and how lithium can be absorbed into the calcite lattice. Experiments and theoretical considerations prove that lithium enters the calcite crystals during their growth, according to strongly differentiated sector absorption mediated by 2D and 1D epitaxy on the corresponding {0001} and {1014} crystal forms.
American Chemical Society
ISSN : 1528-7483
Crystal growth & design A. 2008, vol. 8, n° 9, pp. 3451-3460 [10 pages] [bibl. : 29 ref.]
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