Preparation and growth mechanism of TaCx whiskers

被引：62

作者：

Chen, YJ ^{[1
]}

Li, JB ^{[1
]}

Wei, QM ^{[1
]}

Zhai, HZ ^{[1
]}

机构：

[1] Tsing Hua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

来源：

JOURNAL OF CRYSTAL GROWTH | 2001年 / 224卷 / 3-4期

基金：

中国国家自然科学基金;

关键词：

crystal morphology; growth models; X-ray diffraction; tantalum compounds;

D O I：

10.1016/S0022-0248(01)00673-X

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Tantalum carbide (TaCx) whiskers were successfully synthesized via different methods and different starting raw materials in the presence of Ni powder used for the catalysis of the synthesis. In the Ta2O5-NaCl-C-Ni and Ta2O5NaF-C-C 12H22O11 (sucrose) systems the whiskers grew via a vapor-liquid-solid (VLS) mechanism and exhibit a fairly straight fiber morphology. In the Ta2O5-KCl-C-Ni system, some whiskers grew via a VLS mechanism and others via a LS mechanism. Some whiskers grew with a zigzag shape tip and conical shaped morphology. All whiskers were grown under similar reaction conditions at temperatures which range from 1150 degreesC to 1350 degreesC in a nitrogen ambient atmosphere. The compositions, morphology, crystal structure and growth mechanism were investigated in detail. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：244 / 250

页数：7

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