Abstract Cleaved dolomite (CaMg(CO3)2) crystals were immersed in supersaturated, saturated, and undersaturated solutions with respect to zabuyelite (Li2CO3), and the growth process was characterized using atomic force microscopy (AFM) and scanning electron microscopy (SEM). In all cases, overgrowths formed by 2D-nucleation could be clearly distinguished in the lateral force images recorded by AFM. With highly supersaturated solutions, AFM imaging was hindered by the formation of 3D crystal aggregates. When saturated solutions were used, the overgrowths reproduce the topography of the substrates, indicating that the lattice of the overgrown phase undergoes a compressive strain. Furthermore, we performed a nanotribological characterization by sliding a nanotip over both the 2D-overgrowths and dolomite substrates. Thus, friction coefficients, µ, could be easily quantified. As a result, a µ = 0.08 on the 2D-overgrowths was measured, which is one order of magnitude lower than the value of µ = 0.89 on the dolomite substrate. This friction reduction in the sliding of a nanotip on the overgrowth as compared to the friction observed on the dolomite substrate, together with the fact that atomic-scale stick-slip is observed on dolomite but not on the 2D overgrowths, point towards an anomalously weak interaction of Li2CO3 overgrowths with the AFM probe.

中文翻译：

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Zabuyelite Li2CO3 在白云石和 Kutnohorite {10.4} 表面从过饱和和欠饱和溶液形成：纳米尺度的生长行为和异常摩擦

摘要 将劈裂的白云石 (CaMg(CO3)2) 晶体浸入过饱和、饱和和欠饱和的 Zabuyelite (Li2CO3) 溶液中，并使用原子力显微镜 (AFM) 和扫描电子显微镜 (SEM) 表征其生长过程。在所有情况下，通过 AFM 记录的横向力图像可以清楚地区分由 2D 成核形成的过度生长。对于高度过饱和的溶液，3D 晶体聚集体的形成阻碍了 AFM 成像。当使用饱和溶液时，过度生长会重现基底的形貌，表明过度生长相的晶格会受到压缩应变。此外，我们通过在 2D 过度生长和白云石基底上滑动纳米尖端来进行纳米摩擦学表征。因此，摩擦系数 µ，可以很容易地量化。结果，测量到二维过度生长的 μ = 0.08，比白云石基底上的 μ = 0.89 的值低一个数量级。与在白云石基底上观察到的摩擦相比，纳米尖端在过度生长上滑动的这种摩擦减少，以及在白云石上观察到原子级粘滑而不是在 2D 过度生长上的事实，指向异常弱Li2CO3 过度生长与 AFM 探针的相互作用。