Effect of the stoichiometry on the electronic structure of the Ni (111)/α-A12O3 (0001) interface: a first-principles investigation

• 来源期刊: 中国物理B（英文版）
• 关键词: metal/ ceramic interface stoichiometry electronic structure first-principles calculations
• 年，卷（期）: 2008,（7）
• 页码范围: 2655-2661
• 页数: 7页
• 语种: 英文

摘要

In this paper first-principles calculations of Ni (111)/α-Al2O3 (0001) interfaces have been performed, and are compared with the preceding results of the Cu (111)/α-Al2O3 (0001) interface [2004 Phil. Mag. Lett. 84 425]. The Al-terminated and O-terminated interfaces have quite different adhesion mechanisms, which are similar to the Cu (111)/α-Al2O3 (0001) interface. For the O-terminated interface, the adhesion is caused by the strong O-2p/Ni-3d orbital hybridization and ionic interactions. On the other hand, the adhesion nature of the Al-terminated interface is the image-like electrostatic and Ni-Al hybridization interactions, the latter is substantial and cannot be neglected. Charge transfer occurs from Al2O3 to Ni, which is opposite to that in the O-terminated interface. The charge transfer direction for the Al-terminated and O-terminated Ni (111)/α-Al2O3 (0001) interfaces is similar to that in the corresponding Cu (111)/α-Al2O3 (0001) interface, but there exist the larger charge transfer quantity and consequent stronger adhesion nature, respectively.