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  • 2005-2009  (3)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Electrochemical Fabrication of Bi〈sub〉x〈/sub〉Te〈sub〉1-x〈/sub〉 (0.4 ≤ x ≤ 0.7) Nanowire Arrays (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 2171-2174 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Large scale and highly ordered thermoelectric BixTe1-x (0.4 ≤ x ≤ 0.7) nanowire arrayswere successfully fabricated by cathodic electrolysis into porous anodic alumina membrane (AAM)templates in aqueous solution. The structure of the nanowires was characterized by X-raydiffraction and selected-area electron diffraction (SAED). Field emission scanning electronmicroscopy (FE-SEM) and transmission electron microscopy (TEM) results show that thenanowires are smooth and uniform with the diameters of about 50 nm and lengths up to tens ofmicrometers. Energy dispersive spectroscopy (EDS) was used to check the exact stoichiometry ofas-prepared samples. The results reveal that the atomic ratio between Bi and Te can be modulatedeffectively by controlling the concentration of the electrolyte solution. The synthesis of high qualityBixTe1-x nanowires with controllable x is significant for optimizing the thermoelectric performance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.2171.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Temperature on La〈sub〉1.85〈/sub〉Sr〈sub〉0.15〈/sub〉CuO〈sub〉4〈/sub〉 Single Crystal Growth by Floating Zone Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1897-1900 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Superconducting single crystals of La1.85Sr0.15CuO4 have been grown at varioustemperatures without single crystal seeds by the traveling-solvent floating-zone method. In order toavoid the formation of bubbles during the crystal growth process, a flowing atmosphere of 2 atmoxygen or 1 atm air was applied in different temperature range. It was found that the crystal qualitycould be improved by raising the growth temperature in a certain range, and the orientation changedfrom (110) to (100) at higher temperature. X-ray diffraction results showed that the full-width athalf-maximum of the best as-prepared crystal was 0.086°. The crystals grown in 2 atm oxygenshowed a superconducting transition temperature (Tc) of 37.3 K, while the crystals grown in floatingair showed a Tc of about 35 K and it could be improved to 36.5 K by annealing in flowing oxygen
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1897.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Solution Phase Synthesis of Superconducting La〈sub〉2〈/sub〉CuO〈sub〉4〈/sub〉 Microspheres (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 2071-2074 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In order to exploit new strategies for fabricating high-temperature superconductors withspecial morphologies and investigate the effects on their superconductivity, we successfully utilized afacile polyol process for fabricating a large amount of La2CuO4 (LCO) microspheres usingLa(CH3COO)3·1.5H2O and Cu(CH3COO)2·H2O as raw materials and ethylene glycol as both complexagent and solvent. The well crystallized LCO microspheres can be obtained by annealing theLa-Cu-complex precipitation formed after refluxing process at 750 oC for 10 hours. Field-emissionscanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) resultsindicated that the as-prepared sample had an average diameter of about 800 nm. The powder X-raydiffraction (XRD) patterns showed that the LCO microspheres were of pure phase. The magnetizationmeasurement of the sample annealed at 900 oC in pure oxygen for 20 hours showed that thesuperconducting transition temperature (Tc) of the LCO microspheres was about 38 K, which inagreement with that of bulk counterparts
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.2071.pdf
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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