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Epitaxy of Calcite on Mica

机译:方解石在云母上的外延

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We report for the first time the conditions under which oriented overgrowth of calcite occurs on muscovite mica. Calcite grows in a (001) orientation parallel to the basal cleavage plane on mica surfaces that have been weathered at ambient humidity (35-40%) for periods of at least I h, but no epitaxy is found on freshly cleaved mica. Nanometer-thin K2CO3 crystallites are known to form on mica surfaces weathered in this manner, and our experiments show that the presence of these crystallites during the initial stages of nucleation and growth is necessary for the epitaxial growth of calcite. Calcium ions do not adsorb to mica surfaces at the solution concentrations (<= 20 mM) used in these experiments, and we suggest that the crystallites provide patches on the surface where the local concentration or both carbonate and calcium ions is high enough to promote epitaxy.
机译:我们首次报道了在白云母云母上发生方解石定向过度生长的条件。方解石在平行于基底分裂平面的(001)方向上生长于已在环境湿度(35-40%)下风化至少1 h的云母表面上,但在新鲜分裂的云母上未发现外延。已知在以这种方式风化的云母表面上会形成纳米级的K2CO3晶体,我们的实验表明,在方解石外延生长的成核和生长初期,这些晶体的存在是必需的。在这些实验中使用的溶液浓度(<= 20 mM)下,钙离子不会吸附到云母表面,我们建议微晶在表面上提供斑块,其中局部浓度或碳酸盐和钙离子都足够高以促进外延。

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