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首页> 外文期刊>Crystal growth & design >Growth Rate of Calcite Steps As a Function of Aqueous Calcium-to-Carbonate Ratio: Independent Attachment and Detachment of Calcium and Carbonate Ions
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Growth Rate of Calcite Steps As a Function of Aqueous Calcium-to-Carbonate Ratio: Independent Attachment and Detachment of Calcium and Carbonate Ions

机译：方解石阶跃的增长率作为钙碳酸盐水溶液比的函数：钙和碳酸盐离子的独立附着和分离

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摘要

Growth rates of monolayer-height steps oil the {10 (1) over bar4} calcite surface have been measured its it function of the aqueous calcium-to-carbonate ratio. The maximum growth rates of the two common crystallographic orientations were found to deviate from the ideal stoichiometric ratio of 1:1, and dissolution features were observed under supersaturated solutions containing high calcium-to-carbonate ratios. To explain these phenomena, it theory is applied that treats the rates of attachment and detachment of aqueous calcium and carbonate ions separately. The resultant attachment rate constants are 1-3 orders of magnitude smaller than the water exchange rate of the constituent aqueous ions, suggesting that ligand-exchange processes may directly drive attachment. The broader implication is that the saturation state alone is not adequate to fully describe the rates of the multiple, independent reactions that occur on mineral Surfaces tinder these conditions.
机译：已经测量了在bar4}方解石表面上{10（1）}的单层高台阶油的生长速率，其对含水钙碳比的作用。发现两种常见晶体学取向的最大生长速率偏离理想的化学计量比1：1，并且在含有高钙碳酸盐比的过饱和溶液中观察到溶解特征。为了解释这些现象，应用了将钙和碳酸根离子的附着和分离速度分开处理的理论。所得的附着速率常数比组成水离子的水交换速率小1-3个数量级，这表明配体交换过程可能直接驱动附着。更广泛的含义是，仅饱和状态不足以完全描述矿物表面上发生的多个独立反应的速率，从而限制了这些条件。

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