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http://hdl.handle.net/10773/5321
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DC Field | Value | Language |
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dc.contributor.author | Colomer, María T. | pt |
dc.contributor.author | Fumo, Daniel A. | pt |
dc.contributor.author | Jurado, José R. | pt |
dc.contributor.author | Segadães, Ana M. | pt |
dc.date.accessioned | 2012-01-24T09:54:36Z | - |
dc.date.issued | 1999-10 | - |
dc.identifier.issn | 0959-9428 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/5321 | - |
dc.description.abstract | La(1-x)NiO(3-delta) perovskites present high metallic conductivity and Pauli-paramagnetism, and could be used as electrodes in electrochemical devices such as SOFCs, PEMFCs and MCFCs. Additionally, due to its sigma* conducting band, this material shows a very high electrocatalytic activity, particularly in oxygen reduction processes, with an efficiency comparable to that of platinum. This work describes the combustion synthesis of La(1-x)NiO(3-delta) perovskite powders (x=0 and 0.1) from mixtures of La(NO3)(3). 6H(2)O and Ni(NO3)(2). 6H(2)O as cation precursors, and urea as fuel. The as-prepared combustion product, characterized by XRD, DTA/TG, SEM/TEM, BET and dilatometry (after compaction), shows a much higher specific surface area than powders obtained via alternative routes and contains La2NiO4 with a typical K2NiF4-type structure, together with small amounts of NiO. The usual subsequent heat treatments for 1 to 12 h at successively higher temperatures showed that full conversion to La(1-x)NiO(3-delta) can be readily achieved in air at 750 degrees C and that the perovskite, after the 12 h heat treatment, remains stable up to 1100 degrees C. These results show that the combustion technique is a better and much simpler route to the synthesis of perovskite powders. | pt |
dc.description.sponsorship | JNICT-Portugal (PRAXIS XXI Ph. D. grant BD/11131/97) | pt |
dc.description.sponsorship | Fundación Caja de Madrid-Spain (post-doctoral scholarship) | pt |
dc.description.sponsorship | EC/JOULE - JOE3CT9760049 | pt |
dc.language.iso | eng | pt |
dc.publisher | Royal Society of Chemistry | pt |
dc.rights | openAccess | por |
dc.title | Non-stoichiometric La(1-x)NiO(3-delta) perovskites produced by combustion synthesis | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 2505 | pt |
degois.publication.issue | 10 | - |
degois.publication.issue | 10 | pt |
degois.publication.lastPage | 2510 | pt |
degois.publication.title | Journal of Materials Chemistry | pt |
degois.publication.volume | 9 | pt |
dc.identifier.doi | 10.1039/a902808k | * |
Appears in Collections: | DEMaC - Artigos |
Files in This Item:
File | Description | Size | Format | |
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JMaterChem 9 (1999)2505-2510.pdf | Documento principal | 188.41 kB | Adobe PDF | View/Open |
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