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Ordered and twinned multidomain structure in highly Al-rich mullite

机译:富铝富铝红柱石中的有序和孪晶多畴结构

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摘要

The structure of a region of a highly Al-rich mullite (Al_(4+2x)Si_(2-2x)O_(10-x) with x ~ 0.82; 47Al_2O_3-6SiO_2; Al/Si ~ 16) in a chemically vapor-deposited, functionally graded mullite coating was studied by high-resolution transmission electron microscopy. The region consisted of a fully ordered and twinned multidomain structure. Within each domain, well-ordered oxygen vacancies resulted in antiphase boundaries (APBs) characterized by a shift vector of [001]. The APBs were oriented parallel to (601) and (601). Along [001], the structure consisted of alternating layers of (601)- and (601)-domains with a spacing of 17d_(601), separated by (001) twinning planes. The (001) twinning did not generate any additional spots in the [010] mullite diffraction pattern. The lattice parameters of this ultrahigh Al-rich mullite phase were calculated from selected-area electron-diffraction patterns to be: a = 0.762 nm; b = 0.754 nm; and c = 0.291 nm.
机译:化学气相中高度富铝的莫来石(Al_(4 + 2x)Si_(2-2x)O_(10-x)x〜0.82; 47Al_2O_3-6SiO_2; Al / Si〜16)的区域结构高分辨率透射电子显微镜研究了沉积的,功能梯度的莫来石涂层。该区域由完全有序的孪生多域结构组成。在每个域中,井井有条的氧空位导致了以[001]的位移矢量为特征的反相边界(APB)。 APB的方向平行于(601)和(601)。沿着[001],结构由(601)-和(601)-畴的交替层组成,间隔为17d_(601),由(001)孪晶面隔开。 (001)孪晶在[010]莫来石衍射图中没有产生任何其他斑点。从选定区域的电子衍射图计算出这种超高富铝富铝莫来石相的晶格参数为:a = 0.762 nm; b = 0.754 nm; c = 0.291nm。

著录项

  • 来源
    《Journal of Materials Research》 |2007年第11期|3210-3217|共8页
  • 作者单位

    Department of Manufacturing Engineering, College of Engineering, Boston University, Brookline. Massachusetts 02446;

  • 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 工程材料学;
  • 关键词

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