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Stabilization of Aragonite: Role of Mg2+ and Other Impurity Ions

机译：稳定化芳基石：Mg2 +和其他杂质离子的作用

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摘要

Aragonite formation and stabilization in seawater is still an area of active investigation since the thermodynamically stable product at room temperature is calcite. In this manuscript, purely inorganic systems that were found to stabilize aragonite were analyzed by various techniques. Dynamic light scattering was used to characterize the nucleation behavior of the system, and it was found that the presence of magnesium ions during crystal formation inhibits nucleation overall, not just calcite nucleation. In addition, it was found that sulfate is not necessary to stabilize aragonite. Microanalysis by energy dispersive X-ray spectroscopy and electron backscatter diffraction revealed that the aragonite that was formed had a disordered core with sodium, magnesium, and sulfate ions incorporated into the structure. To the best of the authors' knowledge this is the first time an amorphous calcium carbonate (ACC) core in aragonite has been visualized in a completely abiotic, synthetic system (i.e., in the absence of organic molecules). Inclusion of these impurities into the structure may explain the stability of aragonite in natural seawaters.
机译：由于室温下的热力学稳定产品是方解石的，海水中的化石形成和稳定性仍是积极调查的领域，因为核心化工艺力。在该稿件中，通过各种技术分析了发现稳定化石的纯无机系统。动态光散射用于表征系统的成核行为，发现晶体形成期间的镁离子的存在总体抑制成核，而不仅仅是方解石成核。此外，发现硫酸盐不是必需的稳定化石。通过能量分散X射线光谱和电子反向散射衍射的微量分析表明，形成的含有钠，镁和硫酸盐离子的无序核心。据作者所知，这是第一次在树脂中的无定形碳酸钙（ACC）核心已经在完全非生物的合成系统（即，在没有有机分子的情况下）。将这些杂质包含到结构中，可以解释天然海洋水域中的金属石的稳定性。

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  • 来源
    《Crystal growth & design》 |2020年第8期|共12页
  • 作者

    Boon Matthew; Rickard William D. A.; Rohl Andrew L.; Jones Franca;

  • 作者单位

    Curtin Univ Sch Mol &

    Life Sci Curtin Inst Funct Mol &

    Interfaces Perth WA Australia;

    Curtin Univ John de Laeter Ctr Perth WA Australia;

    Curtin Univ Curtin Inst Computat Perth WA Australia;

    Curtin Univ Sch Mol &

    Life Sci Curtin Inst Funct Mol &

    Interfaces Perth WA Australia;

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  • 正文语种 eng
  • 中图分类 晶体学;
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