中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 17 Special 1 November 2007 |
（1. School of Metallurgical and Ecological Engineering,
University of Science and Technology Beijing, Beijing 100083, China;
2. Ningxia Orient Tantalum Industry Ltd., Shizuishan 753000, China）
Abstract:Tantalum nitride powders with particle size of 20−50 nm were prepared by the homogeneous reduction in liquid ammonia, and were treated at the temperature range from 500 ℃ to 1 170 ℃. The results of XRD analysis indicate that the powders heated up to 500 ℃ are in the form of amorphous. The powder heated at 600 ℃ tends to transform into crystal, the powder heated to temperatures higher than 700 ℃ is clearly of crystal. The results of surface area analysis by BET show that the surface area of the powder increases as the heating temperature increases, and reaches a maximum value of 21.8 m2/g at the heating temperature around 700 ℃.
Key words: homogeneous reduction; tantalum nano powder; BET surface area analysis
