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首页> 外文期刊>Journal of Crystal Growth >Aragonite twinning in gastropod nacre
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Aragonite twinning in gastropod nacre

机译：腹足纲珍珠母中的文石孪生

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摘要

Aragonite twinning in gastropod nacre has been investigated using scanning electron microscopy (SEM), electron back-scattered diffraction (EBSD), and transmission electron microscopy (TEM) with the focused ion beam (FIB) sample preparation technique. At the growth front of nacre, Haliotis discus hannai and Omphalius rusticus form a "stack-of-coins" structures, which consist of pseudo-hexagonal and elliptical aragonite tablets, respectively. SEM, EBSD, and TEM analyses revealed that these tablets are monolithic single crystal and almost free of the {110} twins that are common in aragonite of biotic or abiotic origin. The longest diagonal of the hexagon and the longer axis of the ellipse are parallel to the α-axis of aragonite. The crystal orientation of each tablet in a stack, measured by TEM-Kikuchi pattern analysis, is almost the same but there is occasionally {1 1 0} twin-like relationship between adjacent tablets along the stacking. On the other hand, the fibrous aragonite layer formed prior to the nacreous structure is composed of polycrystalline aragonite with high density of {1 1 0} twins. TEM observation suggests that the interlamellar organic sheet prevents the inheritance of the twins, by selecting only single domain of the twins, through the mineral bridge.
机译：已使用聚焦电子束（FIB）样品制备技术通过扫描电子显微镜（SEM），电子背散射衍射（EBSD）和透射电子显微镜（TEM）研究了腹足纲珍珠母中的文石孪晶。在珍珠质的生长前沿，Haliotis discus hannai和Omphalius Rustus形成“硬币堆叠”结构，分别由假六方和椭圆形文石片组成。 SEM，EBSD和TEM分析表明，这些片剂为单片单晶，几乎不含生物或非生物来源文石中常见的{110}双晶。六边形的最长对角线和椭圆的长轴与文石的α轴平行。通过TEM-菊池图案分析测量的堆叠中的每个片剂的晶体取向几乎相同，但是在沿着堆叠的相邻片剂之间偶尔存在{1 1 0}孪晶状关系。另一方面，在珠状结构之前形成的纤维文石层由具有{1 1 0}孪晶的高密度的多晶文石构成。 TEM观察表明，层间有机层通过仅通过矿物桥选择双胞胎的单个区域来阻止双胞胎的遗传。

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  • 来源
    《Journal of Crystal Growth》 |2010年第20期|p.3014-3019|共6页
  • 作者

    Hiroki Mukai; Kazuko Saruwatari; Hiromichi Nagasawa; Toshihiro Kogure;

  • 作者单位

    Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;

    rnDepartment of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;

    rnDepartment of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan;

    rnDepartment of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    A1. Biomaterials; A1. Crystal morphology; A1. Planar defects; B1. Calcium compounds;

    机译：A1。生物材料;A1。晶体形态A1。平面缺陷;B1。钙化合物;

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