利用电化学方法测定高温银液中氧的扩散系数
收稿日期: 2009-09-04
网络出版日期: 2010-03-11
基金资助
国家高技术研究发展计划项目2006AA06Z125和武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室开放基金资助
MEASUREMENT OF THE DIFFUSIVITY OF OXYGEN IN HIGH-TEMPERATURE LIQUID SILVER BY ELECTROCHEMICAL METHOD
Received date: 2009-09-04
Online published: 2010-03-11
Supported by
Supported by National High Technology Research and Development Program of China No.2006AA06Z125)
采用圆柱体状氧化锆基固体电解质原电池: (+)Pt|air|ZrO2(MgO)|[O]Ag(l)|Ir(-), 利用恒电压法测定了1473-1773 K银液中氧的扩散系数. 通过外加恒电压后测定的电池外电路总电流, 获得随时间变化的穿过固体电解质的氧离子电流, 进而计算得到银液中氧的扩散系数. 在假定符合Arrhenius公式的基础上, 实验结果经最小二乘法处理确定的在1473-1773 K扩散系数与温度的关系为: DO=(1.11±0.04)×10-3exp(-25573±1718/RT). 实验测得的银液中氧的扩散系数值与基于前人低温测定结果外推到本实验温度下的值比较接近. 利用该公式计算得到1773 K下银液中氧的扩散系数 DO=(1.96±0.28)×10-4 cm2/s.
高运明 , 宋建新 , 张业勤 , 郭兴敏 . 利用电化学方法测定高温银液中氧的扩散系数[J]. 金属学报, 2010 , 46(3) : 277 -281 . DOI: 10.3724/SP.J.1037.2009.00579
The diffusivity of oxygen in liquid silver in the temperature range of 1473 to 1773 K were determined by potentiostatic methods employing the following zirconia base solid electrolyte cell arrangement of cylindrical geometry: (+)Pt ︳air ︳ZrO2（MgO）︳[O]Ag(l) ︳Ir(-). The diffusivity of oxygen in liquid silver was calculated from the change of the external current with time by applying a preselected voltage on the electrochemical cell. The relation between oxygen diffusivity and temperature was given: Do=（1.11+-0.04)*10^(-3)exp[(-25573+-1718)/RT]cm2s-1 （1473～1773K） The present experimental results were in close agreement with those extrapolated from the predecessors’ data at low temperature. The diffusivity of oxygen in liquid silver at 1773K was found to be (1.96+-0.28)*10^(-4) cm2s-1.
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