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首页> 外文会议>Ceramic microstructures : Control at the atomic level >MICROSTRUCTURE AND INTERGRANULAR PHASE DISTRIBUTION IN Bi_2O_3-DOPED ZnO
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MICROSTRUCTURE AND INTERGRANULAR PHASE DISTRIBUTION IN Bi_2O_3-DOPED ZnO

机译：Bi_2O_3-掺杂的ZnO的微观结构和晶间相分布

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摘要

The atomic-level distribution of Bi solute in polycrystalline ZnO has been investigated through model experiments utilizing HREM and STEM as analytical tools. In solid-liquid equilibrium, the capillary (sphering) pressure is systematically varied by controlling grain size and liquid fraction. Intergranular phase thicknesses and dihedral angles are found to vary with capillary pressure, a phenomenon which can be understood from the effect of applied pressure on the interparticle force balance and interfacial energy. In the solid state, Bi-saturated boundaries are, surprisingly, also found to contain an amorphous film of nanometer thickness. It is shown that this is the equilibrium configuration of the doped grain boundary, and that in contrast to conclusions from previous studies, virtually all boundaries in Bi-doped ZnO contain a thin intergranular film.
机译：通过使用HREM和STEM作为分析工具的模型实验研究了Bi溶质在多晶ZnO中的原子级分布。在固液平衡中，通过控制晶粒尺寸和液体分数可以系统地改变毛细管（球形）压力。发现晶间相厚度和二面角随毛细管压力而变化，该现象可以从施加的压力对颗粒间力平衡和界面能的影响中理解。令人惊讶地，在固态中，Bi-饱和边界还包含纳米厚度的非晶膜。结果表明，这是掺杂晶界的平衡构型，与先前研究的结论相反，Bi掺杂ZnO中的几乎所有晶界都包含薄的晶间膜。

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  • 来源
  • 会议地点 Berkeley CA(US)
  • 作者

    Yet-Ming Chiang; Jonq-Ren Lee; Haifeng Wang;

  • 作者单位

    Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge, MA 02139;

    Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge, MA 02139;

    Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge, MA 02139;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TQ174.01;
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