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Growth Kinetics and Morphology of Barite Crystals Derived from Face-Specific Growth Rates

机译:从特定于面的生长速率衍生的重晶石晶体的生长动力学和形貌

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摘要

We investigate the growth kinetics and morphology of barite (BaSO4) crystals by measuring the growth rates of the (001), (210), (010), and (100) surfaces using vertical scanning interferometry. Solutions with saturation indices 1.1, 2.1, and 3.0 without additional electrolyte, in 0.7 M NaCl, or in 1.3 mM SrCl2 are investigated. Face-specific growth rates are inhibited in the SrCl2 solution relative to a solution without electrolyte, except for (100). Contrarily, growth of all faces is promoted in the NaCl solution. The variation of face-specific rates is solution-specific, which leads to a. change of the crystal morphology and overall growth rate of crystals. The measured face-specific growth rates are used to model the growth of single crystals. Modeled crystals have a morphology and size similar to those grown from solution. Based on the model the time dependence of surface area and growth rates is analyzed. Growth rates change with time due to surface area normalization for small crystals and large growth intervals. By extrapolating rates to crystals with large surfaces areas, time-independent growth rates are 0.783, 2.96, and 0.513 mmol.m(-2).h(-1), for saturation index 2.1 solutions without additional electrolyte, NaCl, and SrCl2, respectively.
机译:我们通过使用垂直扫描干涉法测量(001),(210),(010)和(100)表面的生长速率来研究重晶石(BaSO4)晶体的生长动力学和形态。研究了在0.7 M NaCl或1.3 mM SrCl2中没有其他电解质的饱和指数1.1、2.1和3.0的溶液。除(100)外,相对于不含电解质的溶液,SrCl2溶液中的面部特异性生长速率受到抑制。相反,在NaCl溶液中促进了所有面部的生长。特定面部比率的变化是特定于解决方案的,这导致晶体形态的变化和晶体的整体生长速度。测得的特定面生长速率用于模拟单晶的生长。建模晶体的形态和大小类似于从溶液中生长的晶体。基于该模型,分析了表面积和增长率的时间依赖性。由于小晶体和大的生长间隔的表面积归一化,生长速率随时间变化。通过将速率外推到具有大表面积的晶体上,对于不添加电解质,NaCl和SrCl2的饱和指数2.1溶液,时间无关的增长率为0.783、2.96和0.513 mmol.m(-2).h(-1),分别。

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