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Thermal Stability Study of Nano-Palladium
Yao Lianzeng1, Ye Changhui1, Mou Jimei1, Li Yuanhong1, Zhang Lide2
1.University of Science and Technology of China,Hefei 230026;2.Institute of Solid State Physics,Chinese Academy of Science,Hefei 230031
Abstract:
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 Arrhenius relation(in the temperature range of 773~523K).The average diameter against the annealing time fits the empirical formula =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.
Key words:  Nano-palladium,Thermal stability,Apparent activation energy
FundProject:国家重大基础研究攀登计划预选和国家自然科学基金(19674051)资助项目
纳米Pd粉的热稳定性研究
姚连增1, 叶长辉1, 牟季美1, 李远红1, 张立德2
1.中国科学技术大学材料科学与工程系合肥 230026;2.中国科学院固体物理研究所合肥 230031
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=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。
关键词:  纳米Pd  热稳定性  表观激活能
DOI:10.1088/1674-0068/13/1/84-88
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