Dielectric and electrical properties of polycrystalline rocks at various hydration levels

Kyritsis, A; Siakantari, M; Vassilikou-Dova, A; Pissis, P; Varotsos, P

dc.contributor.author	Kyritsis, A	en
dc.contributor.author	Siakantari, M	en
dc.contributor.author	Vassilikou-Dova, A	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Varotsos, P	en
dc.date.accessioned	2014-03-01T01:15:33Z
dc.date.available	2014-03-01T01:15:33Z
dc.date.issued	2000	en
dc.identifier.issn	1070-9878	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13579
dc.subject	Comparative Analysis	en
dc.subject	Complex Permittivity	en
dc.subject	Dielectric Properties	en
dc.subject	Dielectric Relaxation	en
dc.subject	Electrical Properties	en
dc.subject	Experimental Data	en
dc.subject	Low Frequency	en
dc.subject	Water Content	en
dc.subject.classification	Engineering, Electrical & Electronic	en
dc.subject.classification	Physics, Applied	en
dc.subject.other	POROUS-MEDIA	en
dc.subject.other	RELAXATION	en
dc.subject.other	SANDSTONES	en
dc.subject.other	POROSITY	en
dc.subject.other	MHZ	en
dc.title	Dielectric and electrical properties of polycrystalline rocks at various hydration levels	en
heal.type	journalArticle	en
heal.identifier.primary	10.1109/94.868067	en
heal.identifier.secondary	http://dx.doi.org/10.1109/94.868067	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	The dielectric properties of low porosity natural polycrystalline rock material (marble) were investigated using broadband 10(-2) to 10(6) Hz) dielectric relaxation spectroscopy at several hydration levels, from dry to fully hydrated samples, with the water content varying from 0 to 0.08% g water/g dry material. The measured dielectric response is characterized by large low frequency dispersions, which depend strongly on the water content. Upon varying the sample thickness, dielectric and water sorption measurements reveal that bulk rather than electrode/sample interface effects are responsible for the main part of the high values obtained for the complex permittivity epsilon. Comparative analysis of the experimental data within the complex permittivity epsilon, impedance Z* and modulus M*, allows a detailed investigation of the ac conductivity mechanisms existing in the rocks and of water content dependency. Concerning the rock-water interaction, a critical water content h(Cl) (h(C) similar to 0.04%, the water content for ambient humidity conditions) has been found.	en
heal.publisher	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC	en
heal.journalName	IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION	en
dc.identifier.doi	10.1109/94.868067	en
dc.identifier.isi	ISI:000089337100007	en
dc.identifier.volume	7	en
dc.identifier.issue	4	en
dc.identifier.spage	493	en
dc.identifier.epage	497	en