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http://hdl.handle.net/10773/6092
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DC Field | Value | Language |
---|---|---|
dc.contributor.author | Soares, M.R.N. | pt |
dc.contributor.author | Leite, S. | pt |
dc.contributor.author | Nico, C. | pt |
dc.contributor.author | Peres, M. | pt |
dc.contributor.author | Fernandes, A.J.S. | pt |
dc.contributor.author | Graça, M.P.F. | pt |
dc.contributor.author | Matos, M. | pt |
dc.contributor.author | Monteiro, R. | pt |
dc.contributor.author | Monteiro, T. | pt |
dc.contributor.author | Costa, F.M. | pt |
dc.date.accessioned | 2012-02-09T12:32:11Z | - |
dc.date.issued | 2011 | - |
dc.identifier.issn | 0955-2219 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/6092 | - |
dc.description.abstract | Samples of Nb2O5 were prepared by laser floating zone (LFZ) technique and by solid-state reaction in order to study some of their physical properties as a function of synthesis conditions. Single crystals fibres were obtained by LFZ, while a structural orthorhombic to monoclinic phase transition was observed in samples sintered at temperature higher than 800°C. Transmission optical spectroscopy and photoconductivity measurements allowed identifying a ∼3.2eV bandgap energy for the H-Nb2O5 monoclinic crystalline phase. Band gap shrinkage of ∼100meV was observed from 14K to RT. For the orthorhombic phase (T-Nb2O5), the photoconductivity measurements evidence a higher energy bandgap. The sintered samples have shown a broad recombination luminescence band at the orange/red spectral region while no luminescence was detected from the LFZ grown fibres. A dielectric constant of ∼40 was found for the 800°C and 1200°C sintered pellets while that of 1000°C reached four times that value. © 2010 Elsevier Ltd. | pt |
dc.description.sponsorship | QREN/Compete – NbO (project no. 5309). | pt |
dc.description.sponsorship | FCT-PTDC/CTM/66195/2006 | pt |
dc.description.sponsorship | SFRH/BD/45774/2008 | pt |
dc.language.iso | eng | pt |
dc.publisher | Elsevier | pt |
dc.relation.uri | http://www.scopus.com/inward/record.url?eid=2-s2.0-78650309248&partnerID=40&md5=89e938e0824a2f936afb75d4aa6beb93 | |
dc.rights | restrictedAccess | por |
dc.subject | Fibres | pt |
dc.subject | Dielectric properties | pt |
dc.subject | Optical properties | pt |
dc.subject | Niobates | pt |
dc.subject | Laser Floating Zone | pt |
dc.title | Effect of processing method on physical properties of Nb2O5 | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 501 | pt |
degois.publication.issue | 4 | pt |
degois.publication.issue | 4 | |
degois.publication.lastPage | 506 | pt |
degois.publication.title | Journal of the European Ceramic Society | pt |
degois.publication.volume | 31 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.identifier.doi | 10.1016/j.jeurceramsoc.2010.10.024 | * |
Appears in Collections: | DFis - Artigos I3N-FSCOSD - Artigos |
Files in This Item:
File | Description | Size | Format | |
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science.pdf | versão pdf do editor | 452.44 kB | Adobe PDF |
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