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- W1984413078 abstract "We present a density-function theory (DFT) study of Bjerrum-defect trapping centers involving the molecular vacancy in ice Ih. As a first step, we compute the intrinsic migration barrier to D-defect motion using the nudged elastic band (NEB) method and find them to be of the same order of magnitude as the energy barriers involving intrinsic L-defect motion. This finding suggests that intrinsic mobility factors cannot explain the experimentally observed inactivity of D defects, supporting the idea that D defects are trapped at other lattice-defect sites. Next we study the defect complexes formed by the combination of isolated D and L defects with a molecular vacancy. The corresponding geometries show that the formation of these aggregates significantly reduces elastic distortions that are present in isolated Bjerrum defects. An analysis of the energetics involved in the formation of both defect complexes reveals a significant binding energy, indicating that the molecular vacancy represents a strong trapping center for Bjerrum defects. On the other hand, the fact that there is no difference between the absolute values of the binding energies for both D and L defects suggests that the vacancy affects both species of Bjerrum defects in a similar fashion, possibly ruling out the vacancy trapping centers as an explanation for the experimentally observed inactivity of D defects." @default.
- W1984413078 created "2016-06-24" @default.
- W1984413078 creator A5000266681 @default.
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- W1984413078 date "2007-10-11" @default.
- W1984413078 modified "2023-09-30" @default.
- W1984413078 title "On the Trapping of Bjerrum Defects in Ice <i>I</i><i><sub>h</sub></i>: The Case of the Molecular Vacancy" @default.
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- W1984413078 doi "https://doi.org/10.1021/jp075661y" @default.
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