Complex permittivity characterization of double oxides of the perovskite crystal structure

Mergos, JA; Daskalakis, JE; Dervos, CT

dc.contributor.author	Mergos, JA	en
dc.contributor.author	Daskalakis, JE	en
dc.contributor.author	Dervos, CT	en
dc.date.accessioned	2014-03-01T02:43:58Z
dc.date.available	2014-03-01T02:43:58Z
dc.date.issued	2006	en
dc.identifier.issn	00849162	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/31587
dc.subject	Complex Permittivity	en
dc.subject	Crystal Structure	en
dc.subject	Dielectric Constant	en
dc.subject	Dielectric Properties	en
dc.subject	Smart Antenna	en
dc.subject	Low Loss	en
dc.subject.other	Chlorine compounds	en
dc.subject.other	Mineralogy	en
dc.subject.other	Minerals	en
dc.subject.other	Mining	en
dc.subject.other	Oxide minerals	en
dc.subject.other	Permittivity	en
dc.subject.other	Perovskite	en
dc.subject.other	Silica	en
dc.subject.other	Silicate minerals	en
dc.subject.other	Dielectric phenomenon	en
dc.subject.other	Electrical insulation	en
dc.subject.other	Mineral structure	en
dc.subject.other	Crystal structure	en
dc.title	Complex permittivity characterization of double oxides of the perovskite crystal structure	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1109/CEIDP.2006.312039	en
heal.identifier.secondary	http://dx.doi.org/10.1109/CEIDP.2006.312039	en
heal.identifier.secondary	4105540	en
heal.publicationDate	2006	en
heal.abstract	Perovskite mineral structure is cubic, with one formula-weight per unit cell. Its name was given by the mineral CaTiO3. A large number of double oxides (as well as some iodates and double halides) are classified as belonging to this type. In this work the dielectric properties of perovskite crystals are presented, namely the complex permittivity (real and imaginary part) and the loss factor (tanδ). Their values in the 20Hz-1MHz frequency range were obtained using the equivalent capacitance - conductance parallel circuit method. Specimens were prepared by mixing TiO2 (of predominantly anatase structure) and CaCO3 (calcite) powders and compressing them uniaxially to form pellets. These were sintered at temperatures as high as 1200°C. According to the XRD results obtained, not only did the anatase convert to rutile and the calcite to lime (CaO), but also the double oxide CaTiO3 was formed, as in the natural perovskite mineral. Its formation was related to higher dielectric constant values and significantly lower losses compared to specimens sintered at lower temperatures, where the perovskite structure was less intense. Such high-κ and low-loss dielectric materials have lately found significant attention in the quest of smart antennas for telecommunication applications. © 2006 IEEE.	en
heal.journalName	Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP	en
dc.identifier.doi	10.1109/CEIDP.2006.312039	en
dc.identifier.spage	744	en
dc.identifier.epage	747	en