Please use this identifier to cite or link to this item:
https://hdl.handle.net/10316/114130
DC Field | Value | Language |
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dc.contributor.author | Elhamdi, I. | - |
dc.contributor.author | Mselmi, F. | - |
dc.contributor.author | Souissi, H. | - |
dc.contributor.author | Kammoun, S. | - |
dc.contributor.author | Dhahri, E. | - |
dc.contributor.author | Sanguino, P. | - |
dc.contributor.author | Costa, B. F. O. | - |
dc.date.accessioned | 2024-03-21T09:14:23Z | - |
dc.date.available | 2024-03-21T09:14:23Z | - |
dc.date.issued | 2023-01-18 | - |
dc.identifier.uri | https://hdl.handle.net/10316/114130 | - |
dc.description.abstract | Solid-state and sol-gel procedures were used to prepare ZnAl1.95Cr0.05O4 nanocrystal spinels. From the results obtained by X-ray diffraction (XRD) and transmission electron microscopy (TEM), it can be concluded that the samples prepared by sol-gel synthesis are better crystallized than the ones resulting from the solid-state method. Studies by spectroscopy of impedance were done in function of frequency (40-107 Hz) and temperature (540-680 K) in the sample prepared by sol-gel synthesis. The electrical conductivity spectra obey Jonscher's law and two models were observed studying the variation of the exponent 's' as a function of temperature, Correlated Barrier Hopping (CBH) and Non-overlapping Small Polaron Tunnelling (NSPT). The predominant conduction mechanism is bipolaron hopping. The scaling behavior of conductivity spectra was checked by Summerfield scaling laws. The time-temperature superposition principle (TTSP) points to a common transport mechanism working for the low and middle frequency ranges. The scaling mechanism fails in the high-frequency ranges suggesting that conduction dynamics, and the usual hopping distance of mobile species, have changed. The values obtained for the activation energy from the hopping frequency, conductivity σ dc, bulk resistance R gb, and relaxation (f max), in the temperature range of 540-680 K, are very close. A higher and negative temperature coefficient of resistivity (TCR coefficient) equal to -2.7% K-1 is found at 560 K. This result shows that our compound is suitable for uncooled infrared bolometric applications and infrared detectors. | pt |
dc.language.iso | eng | pt |
dc.publisher | Royal Society of Chemistry | pt |
dc.relation | UIDB/04564/2020 | pt |
dc.relation | UIDP/04564/2020 | pt |
dc.relation | TAIL-UC facility funded under QREN-Mais Centro Project No. ICT_2009_02_012_1890 | pt |
dc.relation | Tunisian Ministry of Higher Education and Scientic Research within the framework of the Tunisian- Portuguese cooperation (Project of University of Sfax- University of Aveiro) | pt |
dc.rights | openAccess | pt |
dc.rights.uri | http://creativecommons.org/licenses/by-nc/4.0/ | pt |
dc.title | Summerfield scaling model and electrical conductivity study for understanding transport mechanisms of a Cr3+ substituted ZnAl2O4 ceramic | pt |
dc.type | article | - |
degois.publication.firstPage | 3377 | pt |
degois.publication.lastPage | 3393 | pt |
degois.publication.issue | 5 | pt |
degois.publication.title | RSC Advances | pt |
dc.peerreviewed | yes | pt |
dc.identifier.doi | 10.1039/d2ra07701a | pt |
degois.publication.volume | 13 | pt |
dc.date.embargo | 2023-01-18 | * |
uc.date.periodoEmbargo | 0 | pt |
item.fulltext | Com Texto completo | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.languageiso639-1 | en | - |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
crisitem.project.grantno | Center for Physics of the University of Coimbra | - |
crisitem.project.grantno | Center for Physics of the University of Coimbra | - |
crisitem.author.researchunit | CEMMPRE - Centre for Mechanical Engineering, Materials and Processes | - |
crisitem.author.orcid | 0000-0002-4578-9186 | - |
Appears in Collections: | FCTUC Física - Artigos em Revistas Internacionais I&D CFis - Artigos em Revistas Internacionais FCTUC Eng.Mecânica - Artigos em Revistas Internacionais I&D CEMMPRE - Artigos em Revistas Internacionais |
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