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- W2316398412 abstract "Ice XI, the proton-ordered phase of ordinary ice, features aligned water dipoles. It can be synthesized under laboratory conditions at T ∼ 72 K. Recently, speculations on ice XI in the solar system and the role of its possibly large electric fields in planetary formation have appeared in the literature. We have studied the energetics of ice Ih proton configurations using finite ice slabs and periodic supercell density functional theory (DFT) calculations, while properly taking into account the depolarization field associated with increasing proton order. The depolarization field, not taken into account in previous DFT calculations, dominates the energetics, making the existence of ferroelectric ice unlikely. A single order parameter is shown to describe both the surface dangling-bond configuration and the overall polarization state of the slab. According to our calculations, doping ice with alkali hydroxides or placing it in contact with a metal surface stabilizes a net alignment of water molecule dipoles. However, this occurs only at the nonpolarized limit, and the composite systems have no net polarization. Thus, ice XI is antiferroelectric in nature, although it could contain small oppositely polarized domains." @default.
- W2316398412 created "2016-06-24" @default.
- W2316398412 creator A5041562700 @default.
- W2316398412 creator A5042573904 @default.
- W2316398412 creator A5088560331 @default.
- W2316398412 date "2014-10-31" @default.
- W2316398412 modified "2023-10-10" @default.
- W2316398412 title "Ice XI: Not That Ferroelectric" @default.
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- W2316398412 doi "https://doi.org/10.1021/jp510009m" @default.
- W2316398412 hasPublicationYear "2014" @default.
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