ELINER AFFONSO FERREIRA
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Artigo IPEN-doc 23028 Heat treatment and microstructural studies of LaNi-Type battery electrode alloys2017 - FERREIRA, E.A.; BARBOSA, L.P.; FARIA, R.N.The effects of annealing on the microstructures and electrochemical characteristics of a La0.7Mg0.3Al0.3Mn0.4Co0.5Ni3.8 hydrogen storage alloy have been studied. The heat treatment by vacuum annealing was carried out at 700 oC, 800 oC, 900 oC and 1000 oC. The microstructure and phase composition of the alloy have been investigated using inductively coupled plasma - atomic emission spectrometry (ICP-AES), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray diffraction analysis (XRD). The battery anode was prepared using a mixture of the pulverized alloy with carbon black and polytetrafluoroethylene as a binder.Artigo IPEN-doc 20829 Effect of Sn substitution for Co on microstructure and electrochemical performance of ABsub(5) type Lasub(0.7)Mgsub(0.3)Mnsub(0.4)Cosub(0.5)-sub(x)Snsub(3.8)(x=0-0.5) alloys2015 - CASINI, JULIO C.S.; GUO, ZAIPING; LIU, HUA K.; FERREIRA, ELINER A.; FARIA, RUBENS N.; TAKIISHI, HIDETOSHI: The effects of substitution of Sn for Co on the microstructure, hydrogen storage and electrochemical discharge capacity of La0.7Mg0.3Al0.3Mn0.4Co0.5−xSnxNi3.8 (x=0, 0.1, 0.2, 0.3 and 0.5) alloys were investigated using X-ray diffraction (XRD), pressure composition isotherm (PCT) and electrochemical discharge cycle. XRD, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) tests showed that all of alloys are mainly composed of LaNi5 and MgNi2 phases, but when increasing the content of Sn in alloys, the LaNiSn phase appears and microstructure is refined. The PCT showed that increasing substitution of Sn for Co results in decrease of the maximum hydrogen storage capacity from 1.48% (x=0) to 0.85% (x=0.5). The electrochemical tests indicated that the maximum discharge capacity decreases from 337.1 mA·h/g (x=0) to 239.8 mA·h/g (x=0.5); however, the discharge capacity retention at the 100th cycle increases from 70.2% (x=0) to 78.0% (x=0.5).Resumo IPEN-doc 17966 Study on hydrogenation of the La0.7-xMgxPr0.3Al0.3Mn0.4Co0.5Ni3.8 (x=0.0, 0.1 and 0.3) alloys for nickel - metal hydride batteries2011 - CASINI, J.C.S.; GALDINO, G.S.; FERREIRA, E.A.; FARIA, R.N.; TAKIISHI, H.Artigo IPEN-doc 12487 The effect of milling time upon microstructures of Pr-Fe-B HD sintered magnets prepared2007 - SOARES, E.P.; FERREIRA, E.A.; PERIGO, E.A.; TAKIISHI, H.; FARIA, R.N.Artigo IPEN-doc 12485 The effect of the processing temperature on the microstructures of Pr-Fe-Co-Nb HDDR magnets2007 - SILVA, S.C.; FERREIRA, E.A.; FARIA, R.N.; TAKIISHI, H.Artigo IPEN-doc 12483 Microstructure and magnetic properties of PrFeCoBNb sintered magnets produced from Hd and HDDR powder2007 - FERREIRA, E.A.; SILVA, S.C.; PERIGO, E.A.; FARIA, R.N.; TAKIISHI, H.Artigo IPEN-doc 12475 Microstructure and microanalysis studies of some lanthanum-based hydrogen storage alloys2007 - ZARPELON, L.M.C.; FERREIRA, E.A.; TAKIISHI, H.; FARIA, R.N.Artigo IPEN-doc 17926 Microstructure and electrochemical properties of a LaMgAlMnCoNi based alloy for Ni/MH batteries2011 - FERREIRA, E.A.; SERRA, J.M.; CASINI, J.C.S.; TAKIISHI, H.; FARIA, R.N.Artigo IPEN-doc 18816 Microstructure and electrochemical properties of a LaMgAlMnCoNi based alloy for Ni/MH batteries2012 - FERREIRA, E.A.; SERRA, J.M.; CASINI, J.C.S.; TAKIISHI, H.; FARIA, R.N.Artigo IPEN-doc 14030 Microstructure and microanalysis studies of some lanthanum-magnesium based hydrogen storage alloys2008 - ZARPELON, L.M.C.; FERREIRA, E.A.; TAKIISHI, H.; FARIA, R.N.