Impurity Effects on Habit Change and Polymorphic Transitions in the System: Aragonite–Calcite–Vaterite,Crystal Growth & Design

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Impurity Effects on Habit Change and Polymorphic Transitions in the System: Aragonite–Calcite–Vaterite
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2020-03-09 , DOI: 10.1021/acs.cgd.9b01651
Dino Aquilano ₁ , Marco Bruno _{1,

2} , Linda Pastero _{1,

2}

Affiliation

Crystal growth experiments carried out in aqueous solutions, supersaturated with respect to calcite (CaCO₃) at room temperature and pressure, show that the lithium ion added to growth solutions not only acts as a habit modifier of calcite, but promotes the nucleation and growth of the two other CaCO₃ polymorphs: aragonite and vaterite. This behavior is interpreted on the grounds of foreign adsorption going beyond Langmuir’s isotherm model: two-dimensional (2D)-adsorbed nuclei of Li₂CO₃ (mineral zabuyelite) can change, under varying Li⁺ concentrations in solution, the growth habit of calcite, promoting as well both nucleation and growth of aragonite and vaterite, through the mechanism of 2D-epitaxy. Calculation proves how the epitaxy aragonite/2D-zabuyelite reduces the average value of the specific surface energy of aragonite, allowing the nucleation of aragonite and then the coexistence of calcite and aragonite in the same batch. Finally, it is outlined that the 2D lattices fulfilling the epitaxy constraints for the couples calcite/zabuyelite and aragonite/zabuyelite show, as a common feature, a remarkable pseudohexagonality.

中文翻译：

杂质对系统中习惯变化和多晶型转变的影响：文石-方解石-石

在室温和压力下相对于方解石（CaCO ₃）过饱和的水溶液中进行的晶体生长实验表明，添加到生长溶液中的锂离子不仅充当方解石的习性改性剂，而且还促进了方解石的成核和生长另外两种CaCO ₃多晶型物：文石和球ate石。解释这种行为的原因是，异质吸附超出了Langmuir等温模型：在Li ⁺变化的情况下，二维（2D）吸附的Li ₂ CO ₃（矿物杂橄榄石）的核可以改变。通过二维外延机理，溶液中方解石的浓度增加，方解石的生长习性，促进文石和球promoting石的成核和生长。计算证明了外延文石/ 2D-杂油沸石如何降低文石比表面能的平均值，从而使文石成核，然后使方解石与文石在同一批次中共存。最后，概述了满足方解石/ zabuyelite和文石/ zabuyelite夫妇的外延约束的二维晶格，其共同特征是具有显着的伪六边形。

更新日期：2020-04-23

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