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  • 1
    Electronic Resource
    Electronic Resource
    Variation of the dielectric constant of anodic oxide films on titanium with oxygen evolution (1995)
    Springer
    Journal of applied electrochemistry 25 (1995), S. 881-885 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Titanium was anodized potentiodynamically in acidic solution of pH 3 (Na2SO4 + H2SO4) in the potential region before and at oxygen evolution. The oxide film growth efficiency in the range of potential above oxygen evolution was investigated using galvanostatic charging curves. A value of 62% for the efficiency was estimated. The conductivity characteristics of the oxide film formed in the two regions were investigated on the basis of the variation of the dielectric constant. Values of 18.2 and 39.7 for the dielectric constant were obtained for oxides formed in the region before and at the oxygen evolution potential, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233909
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  • 2
    Electronic Resource
    Electronic Resource
    Variation of the dielectric constant of anodic oxide films on titanium with oxygen evolution (1995)
    Springer
    Journal of applied electrochemistry 25 (1995), S. 881-885 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Titanium was anodized potentiodynamically in acidic solution of pH 3 (Na2SO4 + H2SO4) in the potential region before and at oxygen evolution. The oxide film growth efficiency in the range of potential above oxygen evolution was investigated using galvanostatic charging curves. A value of 62% for the efficiency was estimated. The conductivity characteristics of the oxide film formed in the two regions were investigated on the basis of the variation of the dielectric constant. Values of 18.2 and 39.7 for the dielectric constant were obtained for oxides formed in the region before and at the oxygen evolution potential, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00772209
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  • 3
    Electronic Resource
    Electronic Resource
    Anion incorporation and its effect on the dielectric constant and growth rate of zirconium oxides (1996)
    Springer
    Journal of applied electrochemistry 26 (1996), S. 1037-1043 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Mechanically polished zirconium electrodes were potentiodynamically polarized in phosphate buffer solutions of various pH values and in 0.5 lvl NaOH. The results show that the shape of the I-E curves is independent of the solution pH. At relatively low scan rates, oxygen gas evolution was observed. The oxide film thickness was calculated from the values of the charge consumed in the anodic process assuming 100% current efficiency for oxide formation below oxygen evolution (lower values for the current efficiency are assumed for potentials above oxygen evolution). Capacitance measurements, together with the calculated oxide thickness, were used to estimate values for the dielectric constant of the oxide. Two different values of the dielectric constant were obtained for the oxides formed in the range of potential below and above oxygen evolution. Also, higher dielectric constant values were obtained with increasing solution pH. Anion incorporation was assumed to increase the conductivity of the oxide films and, hence, decrease the dielectric constant. A two-layer structure is proposed for the anodically formed oxide on zirconium in aqueous solutions; an anion-free layer near the metal and an outer layer containing the incorporated anions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00242198
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  • 4
    Electronic Resource
    Electronic Resource
    Isothermal crystallization kinetics of the chalcogenide glass Bi10Se70In20 (1991)
    Springer
    Journal of thermal analysis and calorimetry 37 (1991), S. 565-572 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Ergebnisse von isothermen DSC-Untersuchungen an dem Chalkogenglas Bi10Se70In20 wurden beschrieben und diskutiert. Die AktivierungsenergieE a der Kristallisierung wurde mit Hilfe der Johnson-Mehl-Avrami-Gleichung ermittelt und der Kristallisierungsmechanismus untersucht. Die Ergebnisse zeigen, da\ der Kristallisierungsmechanismus von Bi10Se70In20 eindimensionale und OberflÄchenvorgÄnge beinhaltet. Der errechnete mittlere Wert vonE a betrÄgt für Bi10Se70In20 34.38±1.46 kcal/mol.
    Notes: Abstract Results of DSC under isothermal conditions on the chalcogenide glass Bi10Se70In20 are reported and discussed. The Johnson-Mehl-Avrami equation was used to evaluate the crystallization activation energy (E a) and the crystallization mechanism was studied. The results indicate that the crystallization mechanism involves one dimensional and surface processes for Bi10Se70In20. The average calculated value ofE a for Bi10Se70In20 is 34.38±1.46 kcal/mol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913108
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  • 5
    Electronic Resource
    Electronic Resource
    Crystallization kinetics of selenium-tellerium glasses (1992)
    Springer
    Journal of materials science 27 (1992), S. 1757-1761 
    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 Bulk glasses of the compositions Se70Te30 and Se80Te20 were prepared by the melt quenching technique. Differential thermal analyses were performed at different heating rates. The values of the glass transition temperature,T g, the crystallization temperature,T c, and the peak temperature of crystallization,T p, were found to depend on the composition and the heating rate. The activation energy for the glass transition,E i, as well as the activation energy for crystallization,E c, were evaluated from the heating rate dependence ofT g andT p. The crystallization mechanism was examined through analysis of the data under non-isothermal conditions. The results indicated that surface crystallization is dominant for both compositions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01107200
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  • 6
    Electronic Resource
    Electronic Resource
    Electrical and optical properties of evaporated Ag10As30Te60 thin films (1992)
    Springer
    Journal of materials science 27 (1992), S. 675-678 
    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 The temperature dependence of the electrical resistance and the spectral dependence of the optical absorbance of evaporated Ag10As30Te60 thin films were studied. It was found experimentally that the heat treatments cause significant changes in the electrical resistance and the optical absorbance of the chalcogenide film. The results obtained were correlated with the X-ray analyses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00554035
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  • 7
    Electronic Resource
    Electronic Resource
    Differential scanning calorimetric study of Bi10Se80In10 chalcogenide glass (1992)
    Springer
    Journal of materials science 27 (1992), S. 4685-4689 
    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 Results of differential scanning calorimetry under isothermal and non-isothermal conditions on Bi10Se80In10 glass are reported and discussed. By using the Johnson-Mehl-Avrami equation the activation energies for crystal growth have been evaluated and the crystallization mechanism has been studied. The results indicate that the crystallization process is a two-dimensional growth. The average calculated value of activation energy is 330.2 kJ mol−1for Bi10Se80In10 chalcogenide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01166006
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  • 8
    Electronic Resource
    Electronic Resource
    Crystallization study of Bi5Ge20Se75 glass (1995)
    Springer
    Journal of materials science 30 (1995), S. 5737-5742 
    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 Results of thermal analysis performed at different heating rates on the composition Bi5Ge20Se75 are reported and discussed. The values of crystallization temperature (T c) and the peak temperature of the crystallization (T p) were found to be dependent on the heating rates. The activation energy of crystallization E c was evaluated by five different methods. The average value of E c is equal to 119.64+ 6.97 kJ mol−1. The crystallization data are examined in terms of recent analysis developed for non-isothermal conditions. The results indicate a two-dimensional crystal growth for the investigated composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00356714
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  • 9
    Electronic Resource
    Electronic Resource
    Electrical and optical properties of evaporated Ag10As30Te60 thin films (1992)
    Springer
    Journal of materials science 27 (1992), S. 675-678 
    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 The temperature dependence of the electrical resistance and the spectral dependence of the optical absorbance of evaporated Ag10As30Te60 thin films were studied. It was found experimentally that the heat treatments cause significant changes in the electrical resistance and the optical absorbance of the chalcogenide film. The results obtained were correlated with the X-ray analyses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02403878
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Hydrogen evolution reaction on Titanium and oxide-covered titanium electrodes (1991)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 22 (1991), S. 390-395 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The kinetics of HER on Ti electrodes in H2SO4 of various concentrations in the pH range of 0.24-1.88 was studied. Cathodic Tafel lines were measured potentiodynamically at a scan rate 1.0 mVs-1 within the H2 evolution potential range. Linear parallel Tafel lines of a slope of 152 mVdecade-1 were obtained. A value of 0.73 was calculated for the reaction order wrt aH+ using the exchange cd, i0 Tafel lines measured on oxide covered electrodes showed three deviations from linearity. An attempt was made to explain the deviations in terms of hydride formation and chemical oxide dissolution. Tafel slopes of 152 mVdecade-1 were also observed for the HER on oxide-covered electrodes. The nature and composition of the oxide did not depend on the electrolyte in which the oxides were formed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19910221007
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