Kinetics of the nitridation of dysprosium during mechanochemical processing
Kinetics of the nitridation of dysprosium during mechanochemical processing
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DOI：
10.1016/j.jallcom.2014.09.109
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发表时间：
2015-01-25
影响因子：
6.2
通讯作者：
Butt, Darryl P.
中科院分区：
文献类型：
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作者：
Alanko, Gordon A.;Osterberg, Daniel D.;Butt, Darryl P.
在行星式球磨机中，以稀土金属为原料，在400 kPa氮气气氛下进行反应球磨，合成氮化镝。从原位温度和压力测量计算氮消耗速率，以发现在350至650 rpm的研磨速度下作为研磨时间的函数的反应程度。结果进行了分析的基本铣削动力学模型，其中输入的铣削能量是反应的主要驱动力和氮化动力学的速率限制步骤是化学活性表面的形成。该模型不同于传统的气-固反应，其通常受到通过表面层的物质扩散或气体分子解离的限制。这些结果提供了新的洞察反应气-固研磨动力学。(C)2014爱思唯尔有限公司版权所有。
Dysprosium nitride was synthesized by the reactive milling of the rare earth metal under 400 kPa nitrogen gas in a planetary ball mill. The nitrogen consumption rate was calculated from in situ temperature and pressure measurements to find the reaction extent as a function of milling time at milling speeds from 350 to 650 rpm. The results are analyzed in terms of a fundamental milling dynamics model in which the input milling energy is the primary driving force for reaction and the rate limiting step of the nitridation kinetics is the formation of chemically active surfaces. The model differs from traditional gas-solid reactions which are often limited by diffusion of a species through a surface layer or by dissociation of the gas molecule. These results give fresh insight into reactive gas-solid milling kinetics. (C) 2014 Elsevier B.V. All rights reserved.