arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.10172cond-mat.mtrl-sciphysics.comp-ph
收藏

合金氧化物键能的键协同模型

Bond Synergy Model for Bond Energies in Alloy Oxides

Szu-Chia Chien, Wolfgang Windl

摘要:

在这项工作中,我们介绍了一个金属氧化物的键能模型的基础上纯相键能和键的协同因素,描述了合金化的阳离子和氧之间的键能的影响,一个重要的数量来了解钝化膜的形成和稳定性的合金氧化物。该模型是参数化的二元阳离子合金氧化物使用密度泛函理论能量,并被证明是直接转移到多组分合金氧化物。我们参数化的合金氧化物能量与金属阳离子,形成耐腐蚀合金的基础,包括铁,镍,铬,钼,锰,钨,钴,钌的模型。我们发现,等电子溶质允许氧化物中的纯相键能的量化和计算的键能值给出合理的结果相比,共同的经验,包括铬作为钝化层前铁镍铬合金的腐蚀应用的作用。此外,键的协同作用的因素给洞察到的相互加强和削弱合金化的阳离子-氧键的影响,可以与混合焓和电荷中性的限制。我们演示了如何通过不同阳离子根据合金成分和缺陷的存在而呈现的氧化态来识别和实现电中性。

英文摘要:

In this work we introduce a metal-oxide bond-energy model for alloy oxides based on pure-phase bond energies and bond synergy factors that describe the effect of alloying on the bond energy between cations and oxygen, an important quantity to understand formation and stability of passive films. This model is parameterized for binary cation-alloy oxides using density-functional theory energies and is shown to be directly transferable to multi-component alloy oxides. We parameterized the model for alloy oxide energies with metal cations that form the basis of corrosion resistant alloys, including Fe, Ni, Cr, Mo, Mn, W, Co, and Ru. We find that isoelectronic solutes allow quantification of pure-phase bond energies in oxides and that the calculated bond energy values give sensible results compared to common experience, including the role of Cr as the passive-layer former in Fe-Ni-Cr alloys for corrosion applications. Additionally, the bond synergy factors give insights into the mutual strengthening and weakening effects of alloying on cation-oxygen bonds and can be related to enthalpy of mixing and charge neutrality constraints. We demonstrate how charge neutrality can be identified and achieved by the oxidation states that the different cations assume depending on alloy composition and the presence of defects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑