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揭示了在纳米晶体TiN膜中的谷物边界快速化物离子扩散的起源

Yuji Kunisada¹, Chiharu Kura², Norihito Sakaguchi¹

¹Center for Advanced Research of Energy and Materials, Faculty of Engineering, Hokkaido University, N13W8, Kita-ku, Sapporo 060-8628, Japan.

|April 1, 2024

概括

纳米晶体化 (TiN) 膜有助于高效的生产. 颗粒边界空间允许化物离子扩散和选择性透,增强的透性.

科学领域:

材料科学材料科学材料科学
化学工程是化学工程的重要组成部分.
物理化学物理化学

背景情况:

纳米晶化 (TiN) 是用于生产膜的的潜在替代品.
通过TiN膜运输的机制尚未完全理解.

研究的目的:

研究通过纳米晶体TiN膜运输的原子化机制.
阐明谷物边界在透性和选择性中的作用.

主要方法:

建立了粒度边界化物离子运输的原子模型.
利用高分辨率传输电子显微镜和X射线反射性来描述TiN膜.
执行了第一原则密度函数理论计算.

主要成果:

在具有 (100) 首选方向的纳米晶体TiN$_{1.0}$膜中沿粒边界确认了~4 Å宽的界面空间.
计算显示了通过这些边界的界面化物离子缺陷扩散的低激活障碍 (<12 kJ mol^{-1}$).
在谷物边界观察到一个选效应,导致选择性透.

结论:

带有狭窄接口空间的粒度边界微结构对于TiN的高透性至关重要.
这些发现支持TiN作为一种有前途的材料,用于节能生产纯.
实验和理论结果都证实了通过谷物边界扩散运输的机制.

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