Permittivity properties of thermally treated TiO2

Dervos, CT; Thirios, Ef; Novacovich, J; Vassiliou, P; Skafidas, P

dc.contributor.author	Dervos, CT	en
dc.contributor.author	Thirios, Ef	en
dc.contributor.author	Novacovich, J	en
dc.contributor.author	Vassiliou, P	en
dc.contributor.author	Skafidas, P	en
dc.date.accessioned	2014-03-01T01:21:13Z
dc.date.available	2014-03-01T01:21:13Z
dc.date.issued	2004	en
dc.identifier.issn	0167-577X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16142
dc.subject	Crystal structure	en
dc.subject	Dielectric	en
dc.subject	Hardness	en
dc.subject	Heat treatment	en
dc.subject	Permittivity	en
dc.subject	Sintering	en
dc.subject	TiO2	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Physics, Applied	en
dc.subject.other	Calcination	en
dc.subject.other	Ceramic materials	en
dc.subject.other	Compaction	en
dc.subject.other	Crystal structure	en
dc.subject.other	Density (specific gravity)	en
dc.subject.other	Dielectric materials	en
dc.subject.other	Frequency response	en
dc.subject.other	Heat treatment	en
dc.subject.other	Heating	en
dc.subject.other	Microhardness	en
dc.subject.other	Microwaves	en
dc.subject.other	Morphology	en
dc.subject.other	Permittivity	en
dc.subject.other	Powders	en
dc.subject.other	Scanning electron microscopy	en
dc.subject.other	X ray diffraction analysis	en
dc.subject.other	Microwave frequency	en
dc.subject.other	Permittivity response	en
dc.subject.other	Titanium dioxide	en
dc.title	Permittivity properties of thermally treated TiO2	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.matlet.2003.10.012	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.matlet.2003.10.012	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	Pure titanium oxide (TiO2) is an environmentally stable material, having interesting dielectric properties that can be practically utilized for microwave applications, and biological tissue simulations. In this study, the permittivity-frequency response of compressed TiO2 being calcined under different conditions, were investigated for the frequency range 20 Hz - 1 MHz, as well as the microwave frequency regime 2.6-3.2 MHz. The calcination effect on the microcrystal structure has been studied by XRD, SEM and microhardness. The acquired complex permittivity values are correlated to the encountered structural changes: The anatase microcrystal structure (maintained for calcination temperatures below 915 degreesC) exhibits significant ionic-relaxation and value-variations in the low frequency regime. The rutile microcrystal structure almost attains relaxation free permittivity response, with low loss characteristics in the examined frequency range. Calcination temperature of 1180 degreesC provides ceramics with a high packing microcrystal density, having stable epsilon(r)' = 12.3 and tandelta = 2.3 x 10(-3) (at 1 MHz). (C) 2003 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.2003.10.012	en
dc.identifier.isi	ISI:000189131800023	en
dc.identifier.volume	58	en
dc.identifier.issue	9	en
dc.identifier.spage	1502	en
dc.identifier.epage	1507	en