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首页> 外文期刊>Nanoscience and Nanotechnology Letters >Atomic Force Microscopic Investigation on Surface Structure Related to Growth Kinetics on (101) Face of Potassium Dihydrogen Phosphate and Potassium Dideuterium Phosphate (D=99.8%) Crystals
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Atomic Force Microscopic Investigation on Surface Structure Related to Growth Kinetics on (101) Face of Potassium Dihydrogen Phosphate and Potassium Dideuterium Phosphate (D=99.8%) Crystals

机译：原子力显微镜研究与磷酸二氢钾和磷酸二氢钾（D = 99.8％）晶体的（101）面生长动力学相关的表面结构

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摘要

The surface structure on (101) faces of both potassium dihydrogen phosphate (KDP) and potassium dideuterium phosphate (DKDP, D = 99.8%) crystals at various supersaturations were comparatively investigated by using atomic force microscope (AFM). The results revealed that the elemental steps on (101) face for both KDP and DKDP crystals whose step height was about the interplanar distance along [101] directions, could not be bunched together, which meant the step height maintained stable with a rise of supersaturation. However, the growth kinetic related parameter, slope of the steps, was increased with a rise of supersaturation, which was attributed to that the anionic growth units H2PO4- and D2PO4- were prone to be located onto the frontier of the step to narrow the terrace width. Additionally, owing to the dissimilarity of physico-chemical properties of D2PO4- to H2PO4-, such as the lower bond enthalpy of D-O bonds in D2PO4- than that of H-O bonds in H2PO4-, the supersaturation at the growth boundary layer for DKDP crystal was relative lower, which consequently resulted in lower slope of step compared with that for KDP crystal.
机译：使用原子力显微镜（AFM）对磷酸二氢钾（KDP）和磷酸二氘钾（DKDP，D = 99.8％）晶体在（101）面上的表面结构进行了比较研究。结果显示，对于KDP和DKDP晶体，其台阶高度大约为[101]方向的晶面距离，（101）面上的元素台阶不能聚集在一起，这意味着台阶高度随着过饱和度的升高而保持稳定。 。然而，随着过饱和度的增加，与生长动力学相关的参数阶梯的斜率增加，这归因于阴离子生长单元H2PO4-和D2PO4-倾向于位于阶梯的边界上以缩小平台宽度。此外，由于D2PO4-与H2PO4-的物理化学性质不同，例如D2PO4-中的DO键的键焓比H2PO4-中的HO键的键焓低，因此DKDP晶体生长边界层的过饱和度是相对较低，因此与KDP晶体相比，台阶的斜率较低。

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