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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of the thickness dependence of critical current density for electrophoretically deposited YBa2Cu3O7−x films (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 1120-1123 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An attempt has been made to explain the experimental observations regarding variation of critical current density with the film thickness between 3 and 65 μm in electrophoretically deposited YBa2Cu3O7−x films on silver (Ag) substrates. It is not possible to explain the phenomenon using the commonly believed concept of self-field degradation of critical current density of weak links between the grains. On the other hand, an increased grain-boundary resistance due to a lesser degree of silver penetration from the substrate with increasing film thickness is proposed to be the cause of the observed degradation of critical current density. The experimental data agree quite well with those theoretically calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358421
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal stability of pure and lithium intercalated non-stoichiometric V6O13 (1986)
    Springer
    Journal of thermal analysis and calorimetry 31 (1986), S. 1243-1251 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung V6O13+y wurde durch thermische Zersetzung von NH4VO3 hergestellt. Eingelagertes Lithium enthaltende LixV6O13+y-Proben (1 ≤x ≤ 6.0) wurden durch Behandlung von V6O13+y mitn-Butyl-lithium bei Raumtemperatur erhalten. Die thermische Stabilität dieser Verbindungen wurde durch Erhitzen in Argonatmosphäre ermittelt. Die aufeinanderfolgenden Umwandlungen wurden durch thermische Analyse und Röntgendiffraktometrie untersucht. Die thermischen Kurven von V6O13+y sind ziemlich komplex und zeigen einige charakteristische endo- und exotherme Peaks. Reines V6O13+y oxydiert sich beim Erhitzen in einer Argonatmosphäre zu V3O7 und V2O5. Dieser Prozeß geht mit einem breiten exothermen Peak bei 340° einher. Die zwei endothermen Peaks bei 675 und 710° sind dem Schmelzen von V3O7 bzw. V6O13+y zuzuschreiben. Die Verbindungen LixV6O13+y gehen beim Erhitzen unter beträchtlichem Sauerstoffverlust teilweise in ein Gemisch vonv-LiV2O5 und VO2 über. Das Ausmaß dieser Umwandlung steigt mit dem Lithiumgehalt des Ausgangsmaterials an.
    Abstract: Резюме Термическим разложе нием NH4VO3 было получено соединение состава V6O13+ y . Взаимодействие этог о соединения сн-бути ллитием при комнатной температу ре приводило к внедрению лития с обр азованием соединени йLi x V6O13+y с 1⩽x⩽6. Термоусто йчивость полученных соединен ий изучена в атмосфер е аргона. Последовательность превращений была изучена с помощью тер мического анализа и рентгено-структурны ми исследованиями. Термические кривые V6O13+y и Li x V6O13+y очень сложные и характериз уются несколькими эн дои экзотермическими пи ками. При нагревании в атмосфере аргона соединение V6O13+y окисляется до V3O7 и V2O5, чт о связано с широким экзотермическим пик ом около 340°. Два эндотермические пик и при 675 и 710° обусловлены плавлением, соответс твенно, V3O7 и V6O13+y . Соединения Li x V6O13+y при нагревании частично превращаются доv-LiV2O5 и VO2, что сопровождается знач ительной потерей кис лорода. Степень этого превра щения увеличивается с увеличением содержа ния лития в исходном с оединении.
    Notes: Abstract V6O13+y has been prepared by thermal decomposition of NH4VO3. Lithium intercalated LixV6O13+y (1 ≤X ≤ 6.0) specimens have been obtained by room temperature lithiation of V6O13+y withn-butyl lithium. Thermal stability of the compounds has been investigated by heating them in an argon atmosphere. The sequence of transformations has been studied by thermal analysis and X-ray diffraction measurements. The thermal curves of both V6O13+y and LixV6O13+y are characterized by several endo- and exothermic peaks and are quite complex in nature. Pure V6O13+y on heating in an argon atmosphere, oxidizes to V3O7 and V2O5 and this is associated with a broad exothermic peak around 340 °C. The two endothermic peaks at 675 °C and 710 °C are due to the melting of V3O7 and V6O13+y respectively. The compounds LixV6O13+y, on heating, partly transforms to a mixture ofv-LiV2O5 and VO2 accompanied by considerable oxygen loss. The extent of this conversion increases with increasing lithium content of the starting compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01914637
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  • 3
    Electronic Resource
    Electronic Resource
    A New Method of Preparing Tin Dioxide Thin Film Gas Sensors (1998)
    Springer
    Journal of materials science 17 (1998), S. 625-627 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006695518711
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  • 4
    Electronic Resource
    Electronic Resource
    Chemical deposition of ZnO films for gas sensors (1998)
    Springer
    Journal of materials science 9 (1998), S. 441-445 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Zinc oxide (ZnO) thin films were prepared following a chemical, deposition technique using a sodium zincate bath. Structural characterizations by scanning electron microscopy (SEM) and X-ray diffraction (XRD) indicate the formation of ZnO film with a preferred c-axis orientation. The electrical conductance of the ZnO films became stable and reproducible in the 300–500 K temperature range with two activation energy barrier values of 0.3 eV and 0.8 eV in the low temperature (300–420 K) and high temperature (430–500 K) ranges, respectively. The ZnO films prepared by this method are highly resistive, indicating the presence of a large density of oxygen adsorbed acceptor-like trap states (O 2 - , O-, etc.). Palladium sensitized ZnO films were exposed to hydrogen (H2) with air as a carrier gas at different operating temperatures ranging between 150–375°C and the response is evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008993706957
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal transformations of iron(III)-nickel(II) mixed oxide gels (1984)
    Springer
    Journal of materials science 19 (1984), S. 3593-3601 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Iron-nickel mixed oxide gels have been prepared by a hydroxide co-precipitation technique and their thermal transformation has been studied by thermal analyses, X-ray diffraction and infra-red spectroscopy. Differential thermal analysis (DTA) of the hydrated ferric oxide gel indicates the presence of three exothermic peaks along with a broad endotherm. Addition of nickel oxide decreases the intensities of the exotherms and the peaks are completely absent in the samples containing more than 10 mol % of NiO. On the other hand these samples show the presence of three endothermic peaks. Thermal analysis of the sample containing 50 mol % of NiO indicates the formation of a precursor at around 185° C which changes to nickel ferrite at around 275° C. This ferrite slowly crystallizes with a broad exotherm in the range 280 to 550° C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00552271
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis of barium titanate at Iow temperature (1987)
    Springer
    Journal of materials science 6 (1987), S. 787-790 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01729014
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  • 7
    Electronic Resource
    Electronic Resource
    Electrical conductivity and defect structure of polycrystalline tin dioxide doped with antimony oxide (1982)
    Springer
    Journal of materials science 17 (1982), S. 3275-3280 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Electrical conductivity (σ) of tin dioxide doped with antimony has been measured as functions of temperature and oxygen partial pressure (p02〉 ). Variation of electrical conductivity is explained by assuming that the antimony oxide forms a substitutional solid solution and doubly ionized oxygen vacancies are predominant defects. Above −10−5 atm oxygen partial pressure antimony ions are present predominantly in the pentavalent state in tin dioxide lattice. However, it is converted to the trivalent state below this oxygen partial pressure accompanied by a sudden rise in conductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01203495
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  • 8
    Electronic Resource
    Electronic Resource
    Glass formation region and lithium ion conduction in the oxyfluorophosphate glasses (1985)
    Springer
    Journal of materials science 20 (1985), S. 1815-1822 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Oxyfluorophosphate glasses containing about 80 mol% of [LiF+Li2O] show unusually high lithium ion conductivity at elevated temperatures. A detailed investigation has been carried out on the glasses prepared by both conventional cooling and a rapid quenching technique. Chemical analysis of the glasses reveals fluorine loss during melting and it becomes difficult to make glasses with exact predetermined compositions. Electrical conductivity of the glasses, determined from complex impedance analysis increases with Li2O content. A glass with nominal composition 70 LiF∶15 Li2O∶15 Al(PO3)3 shows the highest conductivity (~ 1.3×10−3 ohm−1 cm−1 around 200° C) among all the compositions studied. An interesting feature of the impedance plot is the near perfect semicircle for bulk relaxation indicating a narrow distribution of relaxation times. This has been explained on the basis of a relatively small proportion of lithium ions which are mobile. The electrical conductivity of the glasses is found to be essentailly independent of dissolved water content. The infrared spectra of these glasses (2 to 50μm region) could not produce much useful structural information.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00555288
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  • 9
    Electronic Resource
    Electronic Resource
    Electrical conductivity of polycrystalline tin dioxide and its solid solution with ZnO (1983)
    Springer
    Journal of materials science 18 (1983), S. 2101-2107 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Electrical conductivity (σ) of “pure” and ZnO doped SnO2 has been measured at different temperatures and oxygen partial pressures ( $$p_{{\text{O}}_{\text{2}} } $$ )- From the variation of electrical conductivity of these materials three partial pressure ranges have been identifieD. In the high partial pressure rangeσ increases with decreasing $$p_{{\text{O}}_{\text{2}} } $$ followed by a $$p_{{\text{O}}_{\text{2}} } $$ independent region at lower $$p_{{\text{O}}_{\text{2}} } $$ ´s and finally increases once again with a further decrease of $$p_{{\text{O}}_{\text{2}} } $$ . These variations have been explained on the basis of an anti-Frenkel type defect structure and an interstitial solid solution of ZnO in SnO2. The activation energy for the conduction process has been estimated and the values are found to differ in two different temperature ranges. In the low temperature range the conductivity is attributed mainly to the chemisorption of oxygen on the surface of the specimen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00555004
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  • 10
    Electronic Resource
    Electronic Resource
    Thermal transformations of iron(III)-nickel(II) mixed oxide gels (1984)
    Springer
    Journal of materials science 19 (1984), S. 3593-3601 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Iron-nickel mixed oxide gels have been prepared by a hydroxide co-precipitation technique and their thermal transformation has been studied by thermal analyses, X-ray diffraction and infra-red spectroscopy. Differential thermal analysis (DTA) of the hydrated ferric oxide gel indicates the presence of three exothermic peaks along with a broad endotherm. Addition of nickel oxide decreases the intensities of the exotherms and the peaks are completely absent in the samples containing more than 10 mol % of NiO. On the other hand these samples show the presence of three endothermic peaks. Thermal analysis of the sample containing 50 mol % of NiO indicates the formation of a precursor at around 185° C which changes to nickel ferrite at around 275° C. This ferrite slowly crystallizes with a broad exotherm in the range 280 to 550° C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396931
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