Growth of platelike and branched single-crystalline Si₃N₄ whiskers

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• 作者：Yang ; Weiyou ; Xie ; Zhipeng ; Li ; Jingjing ; Miao ; Hezhuo ; Zhang ; Ligong ; An ; Linan
• 关键词：81.10 ; 81.05.Z ; A. Si₃N₄ whiskers ; B. Crystal growth ; C. Crystal structure and symmetry
• 刊名：Solid State Communications
• 出版年：2004
• 期刊代码：101_00381098
• 类别：ms
• 出版时间：October, 2004
• 卷：132
• 期：3-4
• 页码：263-268
• 文件大小：267 K

摘要

In this communication, we report for the first time the growth of platelike and branched Si₃N₄ whiskers via catalyst-assisted pyrolysis of polymeric precursors. The as-prepared whiskers are single crystalline with a uniform thickness and width. The thickness and width of the Si₃N₄ whiskers range from 200 to 300nm and 800 to 1200nm, respectively. The platelike α-Si₃N₄ whiskers grew along [010] direction, while the branches grew along [001] direction. A growth mechanism based on solid–liquid–gas–solid reaction/crystallization is proposed. The formation of platelike whiskers instead of cylindrical whiskers is attributed to an anisotropic growth at an early nucleation/growth stage.