The epitaxial requirement for the selection of metastable arogonite among the polymorphs of calcium carbonate has been studied. Under calcite-favorable conditions, the critical epitaxial strain with aragonite-type inorganic substrates was found to be in the range 5–7 %. The Figure shows aragonite “fuzz” grown on SrCO3 crystals that were aligned and fractured perpendicular to the alignment axis.
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