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首页> 外文期刊>Journal of Crystal Growth >Prismatic faces of KDP crystal, kinetic and mechanism of growth from solutions
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Prismatic faces of KDP crystal, kinetic and mechanism of growth from solutions

机译：KDP晶体的棱面，溶液的动力学和生长机理

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摘要

Growth kinetic of (100) typefaces of KDP crystals in impure solutions were measured and analyzed. The dual action of impurities as promoters of nucleation at higher supersaturations and as stopper of the spreading layer on the crystal surface at smaller supersaturations is underlined. 2D heterogeneous nucleation mechanism was found to be dominant at higher supersaturations, where the surface coverage of ad-molecules θ ～ 10~(-6) is of the same order of magnitude as the impurity concentration in solution. At smaller supersaturations the dislocation mechanism of growth is severely retarded by the stopper action of impurities. In the transient region, at supersaturations higher than the critical ones, the stoppers action of impurities prevails, substantially decreasing the growth rates. The critical coverage θ~* ～ 10~(-3) at the limit of the "dead" growth zone, suggest large variations of the segregation coefficient with supersaturation for impurities having large energy of adsorption in the surface layer.
机译：测量和分析了KDP晶体在不纯溶液中的（100）字样的生长动力学。强调了杂质的双重作用，即在较高的过饱和度下作为成核促进剂，在较小的过饱和度下作为晶体表面上的扩展层的阻挡层。发现较高的过饱和度时，二维异质成核机制占主导地位，其中ad分子θ〜10〜（-6）的表面覆盖范围与溶液中的杂质浓度相同。在较小的过饱和处，杂质的阻止作用严重阻碍了生长的位错机制。在过渡区中，当过饱和度高于临界值时，杂质的阻滞作用占主导，从而大大降低了生长速率。在“死”生长区的极限处的临界覆盖角θ〜*〜10〜（-3），表明在表层中具有大吸附能的杂质的分离系数随过饱和而变化很大。

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