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0002828241
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vö given in R. A. De Souza and J. A. Kilner, Solid State Ionics, 106, 175 (1998).
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vö given in R. A. De Souza and J. A. Kilner, Solid State Ionics, 106, 175 (1998).
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14
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77649164604
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Calculations for the dissociation transition state on the fully relaxed orthorhombic MnO2[001] surface are in progress. Preliminary calculations for the transition state on the cubic MnO2[001] surface (with frozen lattice atom positions) yield a barrier height for the dissociation transition state of 1.4 eV relative to the tilted adsorbed superoxide O 2. In this transition state the molecular oxygen adsorbate is located on top of a surface oxygen ion such that the O-O bond is parallel to the Mn-O-Mn bonds in the surface layer. The O-O bond is elongated to 1.50 Å. Simultaneously the distance to the next surface Mn ions is already as short as Mn-O bulk distances which leads to a perceptible energy gain, but the Mn-O ad bond is inclined by 52° relative to the surface plane
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ad bond is inclined by 52° relative to the surface plane.
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16
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0023983223
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77649138784
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ö mobility for BSCF makes its contribution dominant and consequently also accelerates the overall rate.
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ö mobility for BSCF makes its contribution dominant and consequently also accelerates the overall rate.
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28
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60749124956
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L. Wang, R. Merkle. G. Cristiani, B. Stuhlhofer, H.-U. Habermeier and J. Maier, ECS Transactions, 13, 85 (2008).
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29
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77649173788
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At first glance it may seem surprising that despite the high vacancy concentration the direct adsorption of O2 into a surface vacancy (rate determining step of M1) is still slower than the encounter of O 2- or O22- and Vö (rate determining step of M3, However, the high vacancy concentration also accelerates the O2- or O22- and Vö encounter (the average distance between adsorbates and V ö is only ≈ 5.7 Å, i.e. the length of two Vö jumps, and the additional increase of Vö mobility then results in M3 being faster than M1. A decrease of DVö sufr by one order of magnitude (or a significant increase of the adsorption sticking coefficient) would invert the relative sequence of reaction rates while still resulting in a high absolute rate
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sufr by one order of magnitude (or a significant increase of the adsorption sticking coefficient) would invert the relative sequence of reaction rates while still resulting in a high absolute rate.
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