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Influence of the Laser Scanning Rate on the Structure of Rotating Lattice Single Crystal Lines

机译：激光扫描率对旋转晶格单晶线结构的影响

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摘要

Localized controlled heating of glass with a continuous wave laser has introduced the possibility of engineering the lattice of recently discovered rotating lattice single (RLS) crystals and thus obtaining novel metamaterials. Toward this goal, we report the role of the laser scanning speed on the lattice structure of a model system: Sb2S3 straight RLS crystal lines created in a 16SbI(3)-84Sb(2)S(3) glass. The electron backscatter diffraction analysis shows that above a critical laser scanning speed the lattice rotates along the direction of scanning, the rate of lattice rotation is relatively insensitive to scanning speed, and the growth front is symmetric. In contrast, for laser scanning speeds below this critical value, the rate and direction of lattice rotation are strongly affected by the speed. Further, the growth front becomes asymmetric, which promotes the formation of new grains misoriented by <= 10 degrees. These observations are explained in terms of the relative dominance of the temperature gradient from laser scanning vis-a-vis the intrinsic preferred crystallographic direction of crystal growth. In addition to providing guidelines for fabricating the RLS crystal of the desired rate of the lattice rotation, new insight is gained for the mechanism of plumose formation in spherulitic crystals.
机译：具有连续波激光的玻璃的局部受控加热引入了工程工程的可能性，最近发现的旋转晶格单（RLS）晶体并因此获得了新的超材料。对此目标来说，我们报告了激光扫描速度在模型系统的晶格结构上的作用：SB2S3直线RLS在16SBI（3）-84SB（2）S（3）玻璃中产生的晶体线。电子反向散射衍射分析表明，在临界激光扫描速度高于晶格沿扫描方向旋转，晶格旋转速率对扫描速度相对不敏感，并且生长前沿对称。相反，对于低于该临界值的激光扫描速度，格子旋转的速率和方向受到速度的强烈影响。此外，生长前沿变得不对称，这促进了通过<= 10度的错误形成的新晶粒。根据激光扫描Vis-A-Vis的温度梯度的相对优势来解释这些观察结果。除了提供用于制造所需速率速率的RLS晶体的准则之外，对于腓骨形成在球晶晶体中的机制，获得了新的洞察力。

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  • 来源
    《Crystal growth & design》 |2019年第11期|共7页
  • 作者

    Savytskii Dmytro; Musterman Evan; Dierolf Volkmar; Jain Himanshu;

  • 作者单位

    Lehigh Univ Mat Sci &

    Engn Dept S East Packer Ave Bethlehem PA 18015 USA;

    Lehigh Univ Mat Sci &

    Engn Dept S East Packer Ave Bethlehem PA 18015 USA;

    Lehigh Univ Phys Dept 16 Mem Dr East Bethlehem PA 18015 USA;

    Lehigh Univ Mat Sci &

    Engn Dept S East Packer Ave Bethlehem PA 18015 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 晶体学;
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