Reduced O diffusion through Be doped Pt electrodes

Details Reduced O diffusion through Be doped Pt electrodes Reduced O diffusion through Be doped Pt electrodes

1999-03-04

arxiv.org/abs/cond-mat/9903082v1

Physics

Condensed Matter

Materials Science

3 pages, 2 figures

Scientific paper

10.1063/1.124703

Using first principles electronic structure calculations we screen nine elements for their potential to retard oxygen diffusion through poly-crystalline Pt (p-Pt) films. We determine that O diffuses preferentially as interstitial along Pt grain boundaries (GBs). The calculated barriers are compatible with experimental estimates. We find that Be controls O diffusion through p-Pt. Beryllium segregates to Pt GBs at interstitial (i) and substitutional (s) sites. i-Be is slightly less mobile than O and it repels O, thus stuffing the GB. s-Be has a high diffusion barrier and it forms strong bonds to O, trapping O in the GB. Experiments confirm our theoretical predictions.

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