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  • 1
    Digitale Medien
    Digitale Medien
    Structural and Electrochemical Evaluation of a Si Film Electrode Fabricated on a Ni Buffer Layer (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1011-1014 
    Details
    ISSN: 1662-9779
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Physik
    Notizen: Si and Si/Ni thin film electrodes less than 1[removed info]m in total thickness were fabricated on theroughened Cu substrate by rf sputtering. Their surface morphology and crystalline structure werecarefully investigated by means of FESEM and XRD. The morphology of films is dependent on thesurface feature of substrate, and the grown films were amorphous. The initial capacity and the irreversiblecapacity loss of a Li/Si film cell were improved with insertion of a Ni buffer layer. The effect of the filmmorphology on the electrochemical properties of cells was demonstrated based on the observations offilm electrodes
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1011.pdf
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  • 2
    Digitale Medien
    Digitale Medien
    LiNiO〈sub〉2〈/sub〉 Thin Films Fabricated by Diffusion of Li on Ni Tapes (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 505-508 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: LiNiO2 thin films for the application of cathode of the rechargeable battery were fabricated byLi ion diffusion on the surface oxidized NiO layer. Bi-axially textured Ni-tapes with 50 ~ 80 μm thicknesswere fabricated using cold rolling and annealing of Ni-rod prepared by cold isostatic pressing of Nipowder. Surface oxidation of Ni-tapes were conducted using tube furnace or line-focused infrared heaterat 700 ºC for 150 sec in flowing oxygen atmosphere, resulted in NiO layer with thickness of 400 and 800μm, respectively. After Li was deposited on the NiO layer by thermal evaporation, LiNiO2 was formed byLi diffusion through the NiO layer during subsequent heat treatment using IR heater with various heattreatment conditions. IR-heating resulted in the smoother surface and finer grain size of NiO and LiNiO2layer compared to the tube-furnace heating. The average grain size of LiNiO2 layer was 0.5~1 μm, whichis much smaller than that of sol-gel processed LiNiO2. The reacted LiNiO2 region showed homogeneouscomposition throughout the thickness and did not show any noticeable defects frequently found in thesolid state reacted LiNiO2, but crack and delamination between the reacted LiNiO2 and Ni occurred as thereaction time increased above 4hrs
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.505.pdf
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  • 3
    Digitale Medien
    Digitale Medien
    Texture and Microstructure in Ni-W Alloy Tape Manufactured by the Powder Metallurgy Process (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1493-1496 
    Details
    ISSN: 1662-9779
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Physik
    Notizen: Ni-3at.%W alloy tapes for YBCO coated conductor were fabricated by powder metallurgyprocess including powder compaction, cold isostatic pressing(CIP), cold rolling and annealing forrecrystallization. The Ni-3at.%W tapes annealed in an atmosphere of 96%Ar and 4%H2 mixing gaswere characterized by X-ray pole figures, orientation distribution function(ODF) and opticalmicroscopy(OM). The Ni-W alloy tapes were heat-treated at 700~1000℃ for the development ofcube texture {001}〈100〉. The texture analysis indicated that as fabricated tapes have a sharp cubetexture after annealing at 900 and 1000℃. Also, thoroughly recrystallization takes place for theannealed tapes at the both temperatures and the average grain size of the two tapes is about the same,which is about 35㎛
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1493.pdf
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  • 4
    Digitale Medien
    Digitale Medien
    Thermal Sulfidation Behavior of Ti-Ni Alloys (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 486-487 (June 2005), p. 622-625 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Ti and Ni sulfides were formed on the surface of Ti-Ni alloys by isothermal annealing at various sulfur pressures, and then microstructures of the surface sulfide layers were investigated by means of scanning electron microscopy and X-ray diffractions. Morphology of sulfurized surface changed from granular shape to porous shape at the sulfur pressure of 80 kPa, which is related to the change in sulfide from NiS1.97 to NiS. Two-layered sulfide was observed in which the inner layer was mainly Ti8.2S11 , and the outer layer was a mixture of NiS1.97 and NiS. The discharge curve of the Ti and Ni sulfides cathode formed on the Ti-Ni current collector at the first cycle showed a plateau voltage of 1.6 V, and the discharge capacity was found to be about 530 mAh/g-NiS1.97
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.486-487.622.pdf
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  • 5
    Digitale Medien
    Digitale Medien
    Fabrication of Ni Sulfides by Thermal Sulfidation (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 510-511 (Mar. 2006), p. 318-321 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: The microstructure of Ni sulfides prepared by thermal sulfidation of pure Ni and theirdependence of fabrication parameters were investigated by means of scanning electron microscopy and X-ray diffractions. Sulfidation was made by isothermally annealing Ni with the sulfur in vacuum sealed glass ampoules at 673 K for 120 – 600s under the sulfur pressure of 100 and 220 kPa. The sulfide layers formed in the early stage were found to consist of spherical particles smaller than 0.5um, which were grown and agglomerated with increasing annealing temperature.Thickness of sulfides developed on Ni substrate was found to increase with increasing annealing time and sulfur pressure. It was also found that compositions of dominant Ni sulfides changed with varying annealing time. At the initial stage, only Ni3S2 sulfide was formed on pure Ni, which was tightly bonded to Ni substrate. On increasing annealing time, NiS sulfide was formed. On further increasing annealing time, NiS1.97 sulfide was formed, which always coexisted with NiSsulfide. A mechanism for sulfidation of Ni is proposed as follows:3Ni + 2S [removed info] Ni3S2, Ni3S2 +S [removed info] NiS, NiS + S [removed info] NiS1.97
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.510-511.318.pdf
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  • 6
    Digitale Medien
    Digitale Medien
    Characterization of GaP Nanowires Synthesized by Chemical Vapor Deposition (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 25-28 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Gallium phosphide nanowires were successfully synthesized by the catalytic chemicalvapor deposition (CVD) method using MgO powder-impregnated nickel oxide as catalyst andgallium phosphide and gallium powders as GaP source. The synthesis of GaP nanowires werecarried out at 900℃ for 30min under argon ambient and directly vaporized Ga and GaP powder.The diameter of GaP nanowires is about 25~70nm and the length is up to several tens ofmicrometers. The GaP NWs was core-shell structure, which consists of the GaP core and the Gaoxide outer layers. The GaP nanowires have a single-crystalline zinc blend structured crystals withthe [111] growth direction. Nanowires larger than around 50nm in diameter exhibited twinningfaults, which appears in the TEM images as discrete dark lines and alternating wire contrast. Wedemonstrate that MgO powder-impregnated nickel oxide catalyst exhibited a large catalytic effecton the growth of high-purity and -quantity gallium phosphide(GaP)
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.25.pdf
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  • 7
    Digitale Medien
    Digitale Medien
    Consideration of Fe Nanoparticles and Nanowires Synthesized by Chemical Vapor Condensation Process (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 29-32 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Various physical, chemical and mechanical methods, such as inert gas condensation,chemical vapor condensation, sol-gel, pulsed wire evaporation, evaporation technique, andmechanical alloying have been used to synthesize nanoparticles. Among them, chemical vaporcondensation(CVC) represents the benefit for its applicability to almost materials because a widerange of precursors are available for large-scale production with a non-agglomerated state. In thiswork, iron nanoparticles and nanowires have synthesized by chemical vapor condensation(CVC)process, using iron pentacarbonyl(Fe(CO)5) as precursor. The effects of processing parameters on themorphology, microstructure and size of iron nanoparticles and nanowires were studied. Ironnanoparticles and nanowires having various diameters were obtained by controlling the inflow ofmetallic organic precursor. Both nanoparticles and nanowires were crystallized. Characterization ofobtained nanoparticles and nanowires were investigated by using a field emission scanning electronmicroscopy, transmission microscopy and X-ray diffraction
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.29.pdf
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  • 8
    Digitale Medien
    Digitale Medien
    Growth and Microstructure of Gallium Phosphide Nanowires Synthesized by the CVD Method Using Copper Oxide as a Catalyst (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 544-545 (May 2007), p. 63-66 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: High purity nanowires are successfully synthesized by chemical vapor deposition. In thiswork, we have tried synthesis of GaP nanowires with copper oxide catalyst using chemical vapordeposition method involving a metal oxide-assisted vapor-liquid-solid (VLS) growth mechanism.The synthesis process is the same as that described in existing work except for a catalyst. Themixture of GaP and Ga powder was used as GaP source for synthesis of GaP nanowires. And themixture powder was directly vaporized in the range of 700~1000°C under argon ambient in afurnace. The wire-like products was observed in the range of 800~950°C. The diameter ofnanowires increases with increasing synthesis temperature, but reversely, the length of nanowiresdecreases steadily. The nanowires prepared at 850°C possess perfect wire-like shape and uniformdistribution of diameter. The average diameter and length of nanowires are about 50[removed info] and 150[removed info],respectively. HRTEM and EDX analysis were carried out to obtain more detailed information of itsmicrostructure. Nevertheless, all condition of processing was set for making the high purity GaPnanowires as existing reported method, the nanowires were identified as well-crystallized galliumoxide nanowires with an amorphous outer layer. It does not accord with existing reported results.This result means that the catalysts play a key role in the growth of nanowires
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.63.pdf
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  • 9
    Digitale Medien
    Digitale Medien
    Structure and Electrochemical Properties of FeS〈sub〉x〈/sub〉 Nanoparticles Synthesized by Chemical Vapor Condensation Process (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 510-511 (Mar. 2006), p. 950-953 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: FeSx nanoparticles were synthesized by the chemical vapor condensation (CVC) process using the pyrolysis of iron pentacarbonyl (Fe(CO)5) and sulfur (S). The influence of CVC parameter on the formation of nanoparticle and size distribution was studied. The synthesized nanoparticles consisting of FeS, FeS2 and Fe2O3 were nearly spherical shape and 5~40 nm in mean diameter.Obtained particles were studied by applying the field emission scanning electron microscopy (FESEM) and high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) methods. Electrochemical properties of the electrode fabricated with synthesized nanoparticles were evaluated
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.510-511.950.pdf
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  • 10
    Digitale Medien
    Digitale Medien
    Characterization of Fe-Mo Alloyed Nanoparticles Synthesized by Chemical Vapor Condensation Process (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 510-511 (Mar. 2006), p. 466-469 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Iron(Fe)-molybdenum(Mo) alloyed nanopaticles and nanowires were produced by the chemical vapor condensation(CVC) process using the pyrolysis of iron pentacarbonyl(Fe(CO)5) and molybdenum hexacarbonyl(Mo(CO)6). The influence of CVC parameter on the formation of nanoparticle, nanowire and size control was studied. The size of Fe-Mo alloyed nanoparticles can be controlled by quantity of gas flow. Also, Fe-Mo alloyed nanowires were produced by control of thework chamber pressure. Obtained nanoparticles and nanowires were investigated by field emission scanning electron microscopy, transmission electron microscopy and X-ray diffraction
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.510-511.466.pdf
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