Abstract A series of potassium dihydrogen phosphate (KDP) crystals and Fe3+ doped KDP crystals were grown by “point seed” technique at different supersaturation. The prismatic faces growth rate of KDP crystals were measured by laser polarization interference system. The surface morphology of growth steps on {1 0 0} face were comparatively researched by atomic force microscope (AFM) systematically. The results showed that the crystal growth rate increased with the rise of supersaturation. It was interesting that the growth rate of KDP crystals in Fe3+ doped solution was faster than in un-doped solution when the supersaturation exceed 6.54%. The step bunching and slope both first increased then reduced and then rise, it shaped like “N”. The average step width of steps had a trend of first decreased then increased with the rise of supersaturation. The result of inductively coupled plasma (ICP) emission shown that the Fe3+ content increased with the rise of supersaturation. The X-ray diffraction (XRD) pattern suggested that the crystal structure had not changed after doping Fe3+.

中文翻译：

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过饱和对高浓度Fe3+中毒KDP晶体阶跃演化行为的影响

摘要 采用“点晶种”技术在不同过饱和度条件下生长了一系列磷酸二氢钾(KDP)晶体和Fe3+掺杂的KDP晶体。KDP晶体的棱柱面生长速率通过激光偏振干涉系统测量。采用原子力显微镜(AFM)系统比较了{1 0 0}面上生长台阶的表面形貌。结果表明，随着过饱和度的升高，晶体的生长速率增加。有趣的是，当过饱和度超过 6.54% 时，Fe3+ 掺杂溶液中 KDP 晶体的生长速度比未掺杂溶液中快。梯级聚束和坡度均先增大后减小再增大，呈“N”形。台阶的平均步长随着过饱和度的升高呈先减小后增大的趋势。电感耦合等离子体（ICP）发射结果表明，Fe3+含量随着过饱和度的升高而增加。X射线衍射（XRD）图表明掺杂Fe3+后晶体结构没有改变。