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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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不同形貌TaCx晶须的制备及生长机理
, PP. 15-18
Keywords: TaCx晶须,形貌,生长机理
Abstract:
通过不同的原料体系在合适的工艺条件下成功制备出碳化钽晶须(TaCx)。由Ta2O5-NaCl-C-Ni和Ta2O5-NaF-C-C12H22O11(蔗糖)体系制备的晶须呈平直的纤维形态,其生长机理为气-液-固(VLS)机制。由Ta2O5-KCl-C-Ni体系制备的晶须一部分通过VLS机理生长,而另一部分则通过LS机理生长,前者呈四方柱状,后者呈具有锥状柱体和之字形端部的特殊形貌。所有的原料体系均是在相近的工艺条件下进行,即反应温度1150～1350℃,氮气气氛保护。本工作对晶须的化学成分、形貌、晶体结构和生长机理进行了较详细的研究。
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