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Atomic dynamics of stress-induced lattice misalignment structures in a KDP subsurface

机译:KDP地下中应力诱导的晶格未对准结构的原子动力学

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摘要

We present anab initiomolecular dynamics study of the thermal stability and dynamics behaviors of lattice misalignment structures (LMSs) in the subsurface layers of KH2PO4(KDP) crystals. The dehydration process at the atomic scale is observed in the LMS system, which is the same as that in a perfect KDP crystal. However, the paths entering the dehydration process are various. The interesting result is that compared with a perfect KDP crystal, many new paths appear in the LMS system, and even in the same paths, the dehydration is more likely to happen in the LMS system. This leads to a dramatic increase in the dehydration numbers in the LMS system, for which the reasons are given in terms of structural deformation and/or uneven distribution of protons. The results elucidate the underlying atomic mechanism of the effect of LMS defects on the thermal stability of KDP material.
机译:我们在KH2PO4(KDP)晶体的地下层中呈现晶格未对准结构(LMSS)的热稳定性和动力学行为的ANAB初始动力学研究。 在LMS系统中观察到原子标度的脱水过程,其与完美的KDP晶体中的相同。 然而,进入脱水过程的路径是各种各样的。 有趣的结果是,与完美的KDP晶体相比,LMS系统中出现了许多新的路径,即使在相同的路径中,脱水更可能发生在LMS系统中。 这导致LMS系统中的脱水数量的显着增加,原因在于结构变形和/或质子的不均匀分布。 结果阐明了LMS缺陷对KDP材料热稳定性作用的潜在原子机制。

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  • 来源
    《RSC Advances》 |2020年第40期|共9页
  • 作者单位

    Fudan Univ Shanghai Engn Res Ctr Ultraprecis Opt Mfg Dept Opt Sci &

    Engn Shanghai 200433 Peoples R China;

    Fudan Univ Shanghai Engn Res Ctr Ultraprecis Opt Mfg Dept Opt Sci &

    Engn Shanghai 200433 Peoples R China;

    Wenzhou Univ Coll Elect &

    Elect Engn Wenzhou 325035 Peoples R China;

    Fudan Univ Shanghai Engn Res Ctr Ultraprecis Opt Mfg Dept Opt Sci &

    Engn Shanghai 200433 Peoples R China;

    Fudan Univ Shanghai Engn Res Ctr Ultraprecis Opt Mfg Dept Opt Sci &

    Engn Shanghai 200433 Peoples R China;

    Fudan Univ Dept Phys State Key Lab Surface Phys Shanghai 200433 Peoples R China;

    Fudan Univ Shanghai Engn Res Ctr Ultraprecis Opt Mfg Dept Opt Sci &

    Engn Shanghai 200433 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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