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首页> 外文期刊>Crystal growth & design >Effects of the Application of Electric Fields on the Growth of SrB4O7 Crystals by the Micro-Pulling-Down Method
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Effects of the Application of Electric Fields on the Growth of SrB4O7 Crystals by the Micro-Pulling-Down Method

机译：电场应用对微型下拉法对SRB4O7晶体生长的影响

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摘要

SrB_(4)O_(7) (SBO) has received much attention as a solid-state ultraviolet laser crystal for a wide variety of applications such as micromachining and spectroscopy. Here we demonstrate the effects of electric fields E on the growth of SBO crystals along the b axis by the μ-pulling-down method to fabricate SBO with periodic twins, which increases the conversion light intensity. During the growth, the direction of electric fields was alternated for 30 min periods. The crystal fibers were evaluated by polarized optical microscopy, X-ray diffraction, and transmission electron microscopy. Without an external voltage, single SBO crystals grew. In contrast, at E ≥ 400 V/cm needles of SrB_(2)O_(4) appeared inside SBO fibers. At E ≥ 1000 V/cm, new domains of SBO grew from the seed crystals, and interestingly, growth twins were formed perpendicular to growth fronts. Thus, we found that the growth of SBO by the μ-PD method via alternating the application of opposing electric fields exhibits two mechanisms. In contrast, when the electrodes in melt and growth fronts switched to + and ?, respectively, growth fronts changed from concave into convex shapes, irrespective of E . We could explain the relation between the two mechanisms and the inversion of surface shapes, using the convection.
机译：SrB_4）O_7（SBO）作为一种固态紫外激光晶体，在微机械和光谱学等领域有着广泛的应用。在这里，我们通过μ-下拉法制备具有周期性孪晶的SBO，从而增加转换光强度，展示了电场E对沿b轴生长SBO晶体的影响。在生长过程中，电场方向交替30分钟。通过偏光显微镜、X射线衍射和透射电子显微镜对晶体纤维进行了评估。在没有外部电压的情况下，单SBO晶体生长。相比之下，atE≥ 400 V/cm的SrB_2）O_4针状物出现在SBO纤维内。在E≥ 1000 V/cm，SBO的新区域从种子晶体生长，有趣的是，生长孪晶垂直于生长前沿形成。因此，我们发现μ-PD法通过交替施加反向电场来生长SBO表现出两种机制。相反，当熔体和生长前沿的电极切换到+和？，生长前沿分别从凹形变为凸形，与E无关。我们可以用对流来解释这两种机制和表面形状反转之间的关系。

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  • 来源
    《Crystal growth & design》 |2021年第1期|共8页
  • 作者

    Sho Inaba; Ryouta Ishibashi; Harutoshi Asakawa; Takaaki Machida; Yuki Hamada; Ryuichi Komatsu;

  • 作者单位

    Graduate School of Science and Engineering Yamaguchi University;

    Graduate School of Science and Engineering Yamaguchi University;

    Graduate School of Science and Engineering Yamaguchi University;

    Graduate School of Science and Engineering Yamaguchi University;

    Graduate School of Science and Engineering Yamaguchi University;

    Graduate School of Science and Engineering Yamaguchi University;

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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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