Novel Faceted α-SiAlON Micro-Crystals Prepared by Combustion Synthesis
Novel Faceted α-SiAlON Micro-Crystals Prepared by Combustion Synthesis
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DOI：
10.1111/j.1551-2916.2005.00683.x
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发表时间：
2006
影响因子：
3.9
通讯作者：
Guanghua Liu;Kexin Chen;Heping Zhou;C. Pereira;J. Ferreira
中科院分区：
文献类型：
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作者：
Guanghua Liu;Kexin Chen;Heping Zhou;C. Pereira;J. Ferreira
采用燃烧合成法，在适当添加剂的作用下，制备了新型的小面α-SiAlON微晶。这些晶体呈现出各种各样的末端形状，包括光滑平坦的六边形面，由六个小等腰三角形包围的金字塔，以及去除尖锐屋顶的部分金字塔。讨论了不同晶体形状的形成机制，提出了α-SiAlON的台阶外延成核模式。通过这种成核方式，形成了两种有趣的晶体形态：阶梯状塔结构和T形。透射电子显微镜结果表明，棒状α-SiAlON晶体的快速生长方向平行于c轴。
Novel faceted α-SiAlON micro-crystals were prepared by combustion synthesis with proper additives. These crystals exhibited various end shapes, including smooth flat hexagonal faces, pyramids bounded by six small isosceles triangles, and partial pyramids with the sharp roofs removed. The formation mechanisms of different crystal shapes were discussed, and a terraced epitaxial nucleation mode for α-SiAlON was proposed. By this nucleation mode, two interesting crystal morphologies were formed: a terraced tower structure and a T-like shape. Transmission electron microscopy results showed that the fast growth direction of rod-like α-SiAlON crystals was parallel to the c-axis.