Isothermal kinetics of mechanochemically and thermally synthesized Ag from Ag₂O

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• 作者：Gholam Reza KHAYATI^a ; ^{khayati@shirazu.ac.ir} ; ^{rezakhayyati@yahoo.com} ; Kamal JANGHORBAN^b ; Mohamad Hosein SHARIAT^b
• 关键词：isothermal kinetics ; mechanochemical activation ; thermal reduction ; Johnson&ndash ; Mehl&ndash ; Avrami model ; Ag
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2012
• 期刊代码：12_10036326
• 类别：ms
• 出版时间：April, 2012
• 卷：22
• 期：4
• 页码：935-942
• 文件大小：381 K

摘要

The kinetics of isothermal reduction of Ag₂O with graphite under argon atmosphere for a non-activated sample and mechanically activated sample was investigated. It is found that Johnson-Mehl-Avrami model appropriately explained the thermal and mechanochemical synthesis of Ag from Ag₂O+ghraphite mixture. The process kinetics was investigated using the same approach for milled and unmilled samples. The results show that the Avrami exponent of mechanochemical reduction is higher than that of high temperature thermal reduction. Also, the mechanisms of nuclei growth in thermal and mechanochemical reduction are diffusion controlled and interface controlled, respectively.