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首页> 外文期刊>Journal of Crystal Growth >In situ AFM study of the interaction between calcite {1014} surfaces and supersaturated Mn~(2+)-Co_3~(2-) aqueous solutions
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In situ AFM study of the interaction between calcite {1014} surfaces and supersaturated Mn~(2+)-Co_3~(2-) aqueous solutions

机译：方解石{1014}表面与过饱和Mn〜（2 +）-Co_3〜（2-）水溶液之间相互作用的原位原子力显微镜研究

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摘要

Growth of rhodochrosite (MnCO_3) on calcite (1014) substrates from supersaturated aqueous solutions was observed in situ using an atomic force microscope (AFM). The supersaturation with respect to rhodochrosite (expressed as β_(rhod)=a[Mn~(2+) ]a[CO_3~(2-)]/K_(sp, rhod); where a[Mn~(2+)] and a[CO_3~(2-)] are the activities of Mn~(2+) and CO_3~(2-) in the aqueous solution) ranged from 48.89 to 338.04. After an induction period, nuclei of the new phase are formed on the calcite substrate. These nuclei readily reach a significant height (2.2 + 0.2 nm), which remained approximately constant during their lateral spread. The characteristics of the growth pattern of islands of the newly formed phase indicate that there exists an epitaxial relationship between the new phase and the calcite substrate. The islands show a highly anisotropic growth, preferentially spreading along [4 21 ] on the calcite substrate at a rate up to 15 times faster than along [010]. As a result, the islands develop needle and sword blade-like morphologies, elongated along [421] and showing different truncated ends. This unusual elongation is interpreted as the result from a kinetic effect, which is controlled by both the structural characteristic of the calcite (1014) surface and the structure and elastic properties of the overgrowing phase. The lateral growth of islands leads to their coalescence and the formation of a quite homogeneous nanometric layer. The characteristics of the epitaxial growth are in agreement with a Volmer-Weber growth mechanism controlling the formation of the epitaxy. The results obtained in these experiments are compared with those obtained in several similar systems.
机译：使用原子力显微镜（AFM）在原位观察到过饱和水溶液中方解石（1014）衬底上菱锰矿（MnCO_3）的生长。关于菱锰矿的过饱和度（表示为β_（rhod）= a [Mn〜（2+）] a [CO_3〜（2-）] / K_（sp，rhod）；其中a [Mn〜（2+）] a [CO_3〜（2-）]为Mn〜（2+）和CO_3〜（2-）在水溶液中的活性），范围为48.89-338.04。诱导期后，在方解石基质上形成了新相的核。这些原子核很容易达到显着的高度（2.2 + 0.2 nm），在其横向扩展过程中保持大致恒定。新形成相的岛的生长模式的特征表明，新相与方解石基质之间存在外延关系。这些岛表现出高度各向异性的增长，优先在方解石基质上沿[4 21]散布，其扩散速度比沿[010]快15倍。结果，这些岛形成了针状和剑状的形态，沿[421]延伸并显示出截短的末端。这种不寻常的伸长被解释为动力效应的结果，该动力效应由方解石（1014）表面的结构特征以及过度生长相的结构和弹性特性共同控制。岛的横向生长导致它们的合并和相当均匀的纳米层的形成。外延生长的特征与控制外延形成的Volmer-Weber生长机制一致。将这些实验中获得的结果与几种类似系统中获得的结果进行比较。

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