Characterization of insulating particles by dielectric spectroscopy: Case study for CaCO3 powders

Dervos, CT; Mergos, JA; Iosifides, AA

dc.contributor.author	Dervos, CT	en
dc.contributor.author	Mergos, JA	en
dc.contributor.author	Iosifides, AA	en
dc.date.accessioned	2014-03-01T01:21:59Z
dc.date.available	2014-03-01T01:21:59Z
dc.date.issued	2005	en
dc.identifier.issn	0167-577X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16423
dc.subject	Dielectrics	en
dc.subject	Electrical properties	en
dc.subject	Electronic materials	en
dc.subject	Nanomaterials	en
dc.subject	Surfaces	en
dc.subject	Transport mechanisms	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Physics, Applied	en
dc.subject.other	Comminution	en
dc.subject.other	Crystalline materials	en
dc.subject.other	Dielectric materials	en
dc.subject.other	Electric fields	en
dc.subject.other	Electric insulation	en
dc.subject.other	Lasers	en
dc.subject.other	Nanostructured materials	en
dc.subject.other	Natural frequencies	en
dc.subject.other	Particle size analysis	en
dc.subject.other	Polarization	en
dc.subject.other	Potential energy	en
dc.subject.other	Spectroscopic analysis	en
dc.subject.other	Surface phenomena	en
dc.subject.other	X ray diffraction	en
dc.subject.other	Laser granulometry	en
dc.subject.other	Nanomaterials	en
dc.subject.other	Surface polarization	en
dc.subject.other	Transport mechanisms	en
dc.subject.other	Calcite	en
dc.title	Characterization of insulating particles by dielectric spectroscopy: Case study for CaCO3 powders	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.matlet.2005.03.066	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.matlet.2005.03.066	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	This work investigates the permittivity response of crystalline calcite powders produced by pulverizing and milling from well crystallized marble. Crystal characterization of continuous solid and powder compacts was based upon XRD. The particle size of the powders has been characterized by laser granulometry. Different packing densities of the powders were investigated i.e., unpacked, tapped, pressed to form pellets by different forces. The dielectric spectroscopy demonstrates the significance of reduced particle size and material packing density. At low frequencies, particle surface state effects dominate and the applied electrical energy is stored on the surfaces. This induces surface polarization effects that are normally considered in nanodielectric technology. As the size of the particles is reduced the surface polarization effects intensify and extend their frequency range towards the higher frequencies. In the high frequency regime (i.e., f > 100 kHz) the energy supplied by the electric field is stored in the volume of the particles. The dielectric data of the powder is determined by the packing density of the particles. A potential energy model is proposed in order to help workers to envisage the implications of surface vs. volume energy absorption process of sub-micron particle compacts when subjected to AC electric fields. (C) 2005 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Materials Letters	en
dc.identifier.doi	10.1016/j.matlet.2005.03.066	en
dc.identifier.isi	ISI:000230683900027	en
dc.identifier.volume	59	en
dc.identifier.issue	22	en
dc.identifier.spage	2842	en
dc.identifier.epage	2849	en