Materials Science and Mechanical Engineering, Texas A&M University, College Station, Texas 77843, USA.
J Phys Chem A. 2010 Feb 25;114(7):2489-97. doi: 10.1021/jp910964s.
Using ambient pressure X-ray photoelectron spectroscopy, we were able to observe the process of oxidation of tantalum with different morphological parameters. Being able to trace surface evolution during oxidation, we evaluated the activation energy of oxidation under the influence of strain and grain boundaries. It was found that the metal was oxidized through three different stages and there was a transition stage where the phase transformed from suboxides to the equilibrium state of pentoxide. The applied stress and surface defects reduced the activation energy of oxidation.
利用常压 X 射线光电子能谱，我们能够观察到具有不同形态参数的钽的氧化过程。通过跟踪氧化过程中的表面演变，我们评估了应变和晶界影响下的氧化激活能。研究发现，金属经历了三个不同的氧化阶段，存在一个从亚氧化物向五氧化物平衡态转变的过渡阶段。外加应力和表面缺陷降低了氧化的激活能。
