Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/329937
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dc.contributor.CRUESPUNIVERSIDADE DE ESTADUAL DE CAMPINASpt_BR
dc.contributor.authoremailricardo.floriano@fca.unicamp.br; stefano.deleddat@ife.no; bjorn.hauback@ife.no; daniel.leiva@ufscar.br; wjbotta@ufscar.brpt_BR
dc.typeArtigopt_BR
dc.titleIron And Niobium Based Additives In Magnesium Hydride: Microstructure And Hydrogen Storage Propertiesen
dc.contributor.authorFlorianopt_BR
dc.contributor.authorR.; Deleddapt_BR
dc.contributor.authorS.; Haubackpt_BR
dc.contributor.authorB. C.; Leivapt_BR
dc.contributor.authorD. R.; Bottapt_BR
dc.contributor.authorW. J.pt_BR
unicamp.author[Floriano, R.] Univ Estadual Campinas, Fac Ciencias Aplicadas, Rua Pedro Zaccaria, BR-13484350 Limeira, SP, Brazilpt_BR
unicamp.author.external[Floriano, R.pt_BR
unicamp.author.externalDeledda, S.pt_BR
unicamp.author.externalHauback, B. C.] Inst Energy Technol, Phys Dept, POB 40, N-2027 Kjeller, Norwaypt_BR
unicamp.author.external[Leiva, D. R.pt_BR
unicamp.author.externalBotta, W. J.] Univ Fed Sao Carlos, Dept Engn Mat, Rod Washington Luiz,Km 235, BR-13565905 Sao Carlos, SP, Brazilpt_BR
dc.subjectMagnesium Hydrideen
dc.subjectAdditivesen
dc.subjectNanostructuresen
dc.subjectHydrogen Storageen
dc.subjectHigh-energy Ball Millingen
dc.description.abstractIn this study, powder mixtures of MgH2 + 2 mol.% X, with X = Nb, Nb2O5, NbF5, Fe, Fe2O3, FeF3, were processed by mechanical milling at liquid nitrogen temperature (cryomilling). The effect of additives on crystalline structure, thermal properties and hydrogen storage properties of the mixtures were investigated. Morphological investigations indicated a heterogeneous particle size distribution of the powder mixtures and a fine dispersion of additive particles (FeF3) in the MgH2 matrix. High resolution synchrotron radiation X-ray diffraction (SR-XRD) data followed by Rietveld refinements showed a significant reduction on crystallite size for the samples containing fluorides (11 nm) in comparison with the pure MgH2 sample (29 nm). This was related to the mechanical behavior of fluorides during milling with MgH2, which act as a lubricant, dispersing and/or cracking agent during milling, and thus helping to further reduce MgH2 particle size. DSC analysis revealed that fluorides (NbF5, FeF3) are much more effective than oxides (Nb2O5, Fe2O3) and the transition metals (Nb and Fe), respectively, in reduction the desorption temperature. Furthermore, Nb2O5 is more efficient than Fe2O3. Finally, the best results for desorption kinetics were observed for the fluorides: NbF5 and FeF3 (equivalent effect and consistent to the DSC analysis) followed by the oxides: Nb2O5, Fe2O3 and Nb. The addition of Fe was not efficient in comparison with the pure cryomilled sample. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.en
dc.relation.ispartofInternational Journal of Hydrogen Energypt_BR
dc.publisherPergamon-Elsevier Science LTDpt_BR
dc.publisherOxfordpt_BR
dc.date.issued2017pt_BR
dc.date.monthofcirculationmarpt_BR
dc.identifier.citationInternational Journal Of Hydrogen Energy. Pergamon-elsevier Science Ltd , v. 42, p. 6810 - 6819, 2017.pt_BR
dc.language.isoEnglishpt_BR
dc.description.volume42pt_BR
dc.description.issuenumber10pt_BR
dc.description.firstpage6810pt_BR
dc.description.lastpage6819pt_BR
dc.rightsfechadopt_BR
dc.sourceWOSpt_BR
dc.identifier.issn0360-3199pt_BR
dc.identifier.eissn1879-3487pt_BR
dc.identifier.wosidWOS:000399623500039pt_BR
dc.identifier.doi10.1016/j.ijhydene.2016.11.117pt_BR
dc.identifier.urlhttp://www-sciencedirect-com.ez88.periodicos.capes.gov.br/science/article/pii/S036031991633405X?via%3Dihubpt_BR
dc.description.sponsorshipFAPESPpt_BR
dc.description.sponsorshipCNPqpt_BR
dc.description.sponsorshipResearch Council of Norwaypt_BR
dc.description.sponsorship1Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)pt_BR
dc.description.sponsorship1Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)pt_BR
dc.date.available2017-11-13T13:56:46Z-
dc.date.accessioned2017-11-13T13:56:46Z-
dc.description.provenanceMade available in DSpace on 2017-11-13T13:56:46Z (GMT). No. of bitstreams: 1 000399623500039.pdf: 1881298 bytes, checksum: c88d34e696aac363dae6d3bbccb7c9d1 (MD5) Previous issue date: 2017en
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/329937-
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