Depolarization thermocurrents in ice Ih at low temperature depending on the electrode material. Polarization mechanism

Apekis, L; Pissis, P; Boudouris, G

dc.contributor.author	Apekis, L	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Boudouris, G	en
dc.date.accessioned	2014-03-01T01:06:09Z
dc.date.available	2014-03-01T01:06:09Z
dc.date.issued	1983	en
dc.identifier.issn	03926737	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/9191
dc.subject	Polarization and depolarization effects	en
dc.title	Depolarization thermocurrents in ice Ih at low temperature depending on the electrode material. Polarization mechanism	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/BF02453230	en
heal.identifier.secondary	http://dx.doi.org/10.1007/BF02453230	en
heal.publicationDate	1983	en
heal.abstract	Using the depolarization thermocurrent (DTC) method, we studied the low-temperature DTC peak in polycrystalline hexagonal ice Ih with nonblocking, totally blocking and partially blocking electrodes. We found the activation energy W=(0.24±0.01) eV to be independent of the electrode material. The peak temperature was found to be TM=(126±1) K with nonblocking electrodes, TM=(113±2) K with totally blocking electrodes and between them with partially blocking electrodes. The heating rate was 3.5 K/min. The value of the dielectric constant εβ-ε∞ was found to be equal to 174±14 at the temperature T=Tp=130 K with nonblocking electrodes and lower with blocking electrodes. Our results are consistent with a model in which the low-temperature DTC peak in ice is due to the reorientation of water molecules, realized by motion of Bjerrum defects. In the case of blocking electrodes additional Bjerrum and ionic defects (d.c. conductivity of ice) accumulate at the surfaces of the sample. This leads to the lowering of the polarization (smaller ""dielectric constant» εβ-ε∞) and to faster relaxation times (lower TM). © 1983 Società Italiana di Fisica.	en
heal.journalName	Il Nuovo Cimento D	en
dc.identifier.doi	10.1007/BF02453230	en
dc.identifier.volume	2	en
dc.identifier.issue	3	en
dc.identifier.spage	932	en
dc.identifier.epage	946	en