Crystal growth of silicon nitride whiskers through a VLS mechanism using SiO2-Al2O3-Y2O3 oxides as liquid phase
Crystal growth of silicon nitride whiskers through a VLS mechanism using SiO2-Al2O3-Y2O3 oxides as liquid phase
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DOI：
10.1016/s0272-8842(97)00042-4
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发表时间：
1998-01-01
影响因子：
5.2
通讯作者：
Yamakawa, A
中科院分区：
文献类型：
--
作者：
Kawai, C;Yamakawa, A
以SiO_2-Al_2O_3-Y_2O_3氧化物为液相，采用VLS机制在Si3N_4晶须衬底上制备了Si3N_4晶须。使用直径为0.4~0.7微米的Alpha-Si3N4晶须作为种子。晶须包覆SiO_2-Al_2O_3-Y_2O_3氧化物后，在1490℃N~(-2)下加热，包括无定形Si3N4和TiO_2粉末反应生成的气体。结果，种子上新形成了晶须状的产物。种子上长出的胡须的形态类似于玫瑰枝条和长着长腿的蜈蚣。X射线衍射分析表明，新生成的晶须为β-Si3N4。在一些胡须的尖端观察到了液滴。这表明晶须的生长是通过气-固-液(VLS)机制进行的。(C)1997年爱思唯尔科学有限公司和Techna S.r.l.
Si3N4 whiskers were coated on Si3N4 whisker substrates through a VLS mechanism using SiO2-Al2O3-Y2O3 oxides as liquid phases. Alpha-Si3N4 whiskers having diameters of 0.4 to 0.7 mu m were used as seeds. After the seed whiskers were coated with SiO2-Al2O3-Y2O3 oxides, the oxide-coated whiskers were heated at 1490 degrees C N-2 including gas species generated by reacting amorphous Si3N4 and TiO2 powders. Resultantly, whisker-like products were newly formed on the seeds. The morphologies of the resulting whisker growth on the seeds resembled rose-twigs and centipedes with long legs. X-ray diffraction analysis indicated that the newly formed whiskers were beta-Si3N4. Droplets were observed on the tips of some whiskers. This suggested that the whisker growth proceeded through a vapour-solid-liquid (VLS) mechanism. (C) 1997 Elsevier Science Ltd and Techna S.r.l.