| Autor: |
Iedema, M. J., Dresser, M. J., Doering, D. L., Rowland, J. B., Hess, W. P., Tsekouras, A. A., Cowin, J. P. |
| Zdroj: |
The Journal of Physical Chemistry - Part B; November 12, 1998, Vol. 102 Issue: 46 p9203-9214, 12p |
| Abstrakt: |
Partially proton-ordered ice I (cubic) was grown from the vapor phase, from 40 to nearly 150 K. It is believed to be metastable and oriented by the asymmetry of the solid−vacuum interface during growth. This was studied using a Kelvin (work function) probe for ice grown on a single-crystal Pt(111) substrate. The ice grows with a slight preference for the O-end aimed away from the surface, with about 0.2% net up dipole per water molecule at 40 K, or about −3 mV/monolayer of deposited ice film. This decreases with deposition temperature as exp(−T/27 K). Near 130, 140, and 150 K sharp features occur as the ice changes from amorphous to crystalline, and dielectric properties become active. By 150 K the effect seems to be zero. These results are discussed in context with other recent reports on ferroelectric ice. In addition to influencing several kinds of vacuum-based studies of ice, this slight ferroelectricity may allow natural ice vapor-grown in space to develop large electric fields. |
| Databáze: |
Supplemental Index |
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