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Growth kinetics of the {10.4} faces of nitratine (NaNO_3)

机译:硝胺(NaNO_3){10.4}面的生长动力学

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摘要

In this paper, we focus on the measurement of the normal growth rates (R_(104)) of {10.4} faces of nitratine (NaNO_3) single crystals under isothermal conditions in the temperature interval 288-297.5 K in order to unravel the rate determining steps during crystal growth, depending on the hydrodynamic conditions. Owing to the elevated solubility of nitratine in water, the supersaturated system is very sensitive to temperature variation. In this sense, we have constructed a device to control the temperature (its accuracy is below 0.1 K) and the concentration throughout the experiments. We managed to measure the crystal growth of three symmetry equivalent {10.4} faces of NaNO_3 under different hydrodynamic conditions. We found that growth of these faces depends on different rate determining steps (being either surface or volume diffusion limited) according to their position with respect to the solution flow. Finally, some thermodynamic crystallization parameters have been calculated to assess the rate determining steps.
机译:在本文中,我们着眼于在288-297.5 K的温度区间等温条件下测量硝化(NaNO_3)单晶{10.4}面的正常生长速率(R_(104)),以阐明速率确定的方法。晶体生长过程中的步骤取决于流体动力学条件。由于硝胺在水中的溶解度升高,过饱和系统对温度变化非常敏感。从这个意义上讲,我们已经构建了一种可控制温度(精度低于0.1 K)和整个实验过程中浓度的装置。我们设法测量了在不同流体动力学条件下,NaNO_3的三个对称当量{10.4}面的晶体生长。我们发现,这些面的增长取决于其相对于溶液流的位置,取决于不同的速率确定步骤(受表面或体积扩散限制)。最后,已经计算出一些热力学结晶参数以评估速率确定步骤。

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