Year: 2018
Type: article
Abstract: Interface diffusion along a metal/ceramic interface present in numerous energy and electronic devices can critically affect their performance and stability. Hole formation in a polycrystalline Ni film on an α -Al 2 O 3 substrate coupled with a continuum diffusion analysis demonstrates that Ni diffusion along the Ni/ α -Al 2 O 3 interface is surprisingly fast. Ab initio calculations demonstrate that both Ni vacancy formation and migration energies at the coherent Ni/ α -Al 2 O 3 interface are much smaller than in bulk Ni, suggesting that the activation energy for diffusion along coherent Ni/ α -Al 2 O 3 interfaces is comparable to that along (incoherent/high angle) grain boundaries. Based on these results, we develop a simple model for diffusion along metal/ceramic interfaces, apply it to a wide range of metal/ceramic systems and validate it with several ab initio calculations. These results suggest that fast metal diffusion along metal/ceramic interfaces should be common, but is not universal.
Source: Nature Communications
Authors: Aakash Kumar, Hagit Barda, Leonid Klinger, Michael W. Finnis, Vincenzo Lordi, Eugen Rabkin, David J. Srolovitz
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $6,990
Awards: G1088636562, G1356433355, G14554683, G2145270357, Hydro-ML: Symposium on Big Data Machine Learning in Hydrology and Water Resources; Pennsylvania, May 25-29, 2020, G3669113783, G4343739756, G69709960, NSF/DMR-BSF: Diffusion along Metal-Ceramic Interfaces: a combined theoretical and experimental study, G991281326
OpenAlex ID: W2857923920