摘要
采用化学液相合成法制备了纳米Ｐｄ热稳定性研究表明，温度在７７３～５２３Ｋ内，样品的平均粒径ｄ与退火温度Ｔ之间服从Ａｒｒｈｅｎｉｕｓ关系，且平均粒径与退火时间ｔ之间满足经验公式ｄ＝ｋｔｎ。纳米Ｐｄ的热稳定范围Ｔ≤２５０℃。计算得到纳米Ｐｄ颗粒生长的表观激活能为０.１５ｅＶ，远比纳米复合材料的生长激活能小（约为１ｅＶ），故纳米Ｐｄ颗粒极易长大，热稳定范围非常窄。
Nano-crystal palladium was prepared through the Chemical liquid phase synthesis method. Thermal stability study shows that the average diameter of n-Pd against the annealing temperature fits fits Arrhenius relation (in the temperature range of 773-523K). The average diameter against the annealing the fits the empirical formula d=ktn. The thermal stability temperature is below 250℃. By calculating, we get the apparent growth activation energy about 0.15eV, which is far smaller than ordinary nano-composite material. So, n-Pd is very easy to grow, and possesses a narrow thermal stability temperature range.
基金
国家重大基础研究攀登计划
国家自然科学基金!19674051
关键词
热稳定性
表观激活能
钯
钠米钯
Nano-palladium Thermal stability, Apparent activation energy
