Continuous preparation of calcite, aragonite and vaterite, and of magne sium-substituted amorphous calcium carbonate (Mg-ACC)
Continuous preparation of calcite, aragonite and vaterite, and of magne sium-substituted amorphous calcium carbonate (Mg-ACC)
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DOI：
10.1002/zaac.200800134
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发表时间：
2008-01-01
影响因子：
1.4
通讯作者：
Epple, Matthias
中科院分区：
文献类型：
--
作者：
Nebel, H.;Epple, Matthias
采用标准的实验室设备，从无添加剂的水溶液中连续制备了三种无水碳酸钙多晶型物方解石、文石和水晶石。变化参数为混合方式、溶液浓度和反应器停留时间。这些样品在晶体学和化学上都是纯净的，但经过彻底的元素分析，发现其中存在少量的碳酸钠，这是x射线粉末衍射无法检测到的。连续过程避免了间歇合成的固有可变性。通过调整结晶参数，连续制备了镁取代无定形碳酸钙（Mg:Ca摩尔比为1:2.68）。
The three water-free calcium carbonate polymorphs calcite, aragonite and vaterite were prepared from aqueous solutions without additives using standard laboratory equipment in a continuous process. Variation parameters were the way of mixing, the solution concentrations, and the reactor residence time. The samples were crystallographically and chemically pure, but a thorough elemental analysis revealed the presence of small amounts of sodium carbonate which was not detectable by X-ray powder diffraction. The continuous process avoids the inherent variability of batch syntheses. By adapting the crystallization parameters, magnesium-substituted amorphous calcium carbonate (molar ratio of Mg:Ca of 1:2.68) was prepared in this continuous process.