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http://hdl.handle.net/10773/37459
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DC Field | Value | Language |
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dc.contributor.author | Tkach, Alexander | pt_PT |
dc.contributor.author | Amaral, Luís | pt_PT |
dc.contributor.author | Vilarinho, Paula M. | pt_PT |
dc.contributor.author | Senos, Ana M.R. | pt_PT |
dc.date.accessioned | 2023-04-28T14:48:18Z | - |
dc.date.available | 2023-04-28T14:48:18Z | - |
dc.date.issued | 2018-06 | - |
dc.identifier.issn | 0955-2219 | pt_PT |
dc.identifier.uri | http://hdl.handle.net/10773/37459 | - |
dc.description.abstract | Titanium-rich (Sr/Ti = 0.995) strontium titanate (ST) ceramics, air-sintered in a temperature range of 1400–1625 °C, were reported to possess anomalies in the grain growth and analogous anomalies in the grain boundary (GB) conductivity activation energy. However, these two interface-related phenomena, occurring at GBs, could not be associated with each other using a simple “brick-layer” model. In this work we revise the topic and advocate that the deviation from the model comes from the oxygen vacancies localized at GBs of the rapidly-cooled ST ceramics. To verify this, we annealed the ceramics in oxygen and performed their systematic and comparative analysis using impedance spectroscopy. A levelling-off in the GB conductivity activation energy, which increases for ≤1.24 eV, and a four-fold decrease in the GB permittivity are observed after annealing. Thus, we confirm a key role of oxygen vacancies in relation between the grain growth and GB conductivity anomalies of as-sintered Ti-rich ST ceramics. | pt_PT |
dc.language.iso | eng | pt_PT |
dc.publisher | Elsevier | pt_PT |
dc.relation | POCI-01-0145-FEDER-007679 | pt_PT |
dc.relation | info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FCTM%2F50011%2F2013/PT | pt_PT |
dc.relation | info:eu-repo/grantAgreement/FCT/Investigador FCT/IF%2F00602%2F2013%2FCP1162%2FCT0015/PT | pt_PT |
dc.relation | info:eu-repo/grantAgreement/FCT/OE/SFRH%2FBPD%2F97453%2F2013/PT | pt_PT |
dc.rights | openAccess | pt_PT |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | pt_PT |
dc.subject | Strontium titanate | pt_PT |
dc.subject | Grain boundary specific area | pt_PT |
dc.subject | Vacancies | pt_PT |
dc.subject | Oxygen annealing | pt_PT |
dc.subject | Impedance spectroscopy | pt_PT |
dc.subject | Charge transport | pt_PT |
dc.subject | Conduction mechanism | pt_PT |
dc.title | Oxygen vacancies as a link between the grain growth and grain boundary conductivity anomalies in titanium-rich strontium titanate | pt_PT |
dc.type | article | pt_PT |
dc.description.version | published | pt_PT |
dc.peerreviewed | yes | pt_PT |
degois.publication.firstPage | 2547 | pt_PT |
degois.publication.issue | 6 | pt_PT |
degois.publication.lastPage | 2552 | pt_PT |
degois.publication.title | Journal of the European Ceramic Society | pt_PT |
degois.publication.volume | 38 | pt_PT |
dc.identifier.doi | 10.1016/j.jeurceramsoc.2018.01.014 | pt_PT |
Appears in Collections: | CICECO - Artigos DEMaC - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Oxygen Vacancies as a Link between the Grain.pdf | 790.68 kB | Adobe PDF | View/Open |
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