Oxygen and Nitrogen Diffusion in Titanium Nitride

被引：0
作者：
Bakulin, A. V. [1 ]
Chumakova, L. S. [1 ]
Kulkova, S. E. [1 ]
机构：
[1] Russian Acad Sci, Inst Strength Phys & Mat Sci, Siberian Branch, Tomsk 634055, Russia
来源：
PHYSICAL MESOMECHANICS | 2025年 / 28卷 / 01期
关键词：
diffusion; titanium nitride; oxygen; nitrogen; electronic structure; ELASTIC BAND METHOD; OXIDATION BEHAVIOR; RECOMBINATION; MECHANISM; SILICON; POINTS;
D O I：
10.1134/S1029959924600836
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Diffusion of oxygen and nitrogen in titanium nitride was studied using the projector augmented wave method in combination with transition state theory. Atomic migration energies were calculated for two diffusion mechanisms (interstitial and vacancy ones). It was found that the oxygen migration energy by the interstitial mechanism is similar to 0.3 eV lower than that by the nitrogen vacancy mechanism. However, the indirect mechanism of diffusion through the body-centered position of the cubic lattice formed of titanium and nitrogen atoms is more preferable. The estimation of the temperature-dependent coefficient of oxygen and nitrogen diffusion in titanium nitride by the two mechanisms showed their strong dependence on the concentration of thermal vacancies. It was shown that the interstitial diffusion of nitrogen occurs at temperatures below 1500 degrees C, and the vacancy diffusion mechanism prevails at high temperatures. The calculated activation energies and diffusion coefficients showed good agreement with the experimental values. At high concentrations of constitutional vacancies, the coefficients of oxygen diffusion by both mechanisms are comparable with the experimental values for TiO2, and the values obtained at low concentrations remain several orders of magnitude higher than those for Al2O3.
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页码：55 / 65
页数：11
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