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  • activation energy  (2)
  • oxidation  (2)
  • 21.60  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Another Approach to the Modified Zhuravlev Equation on the Basis of the Oxidation of V2O4 and V6O13 (1998)
    Springer
    Journal of thermal analysis and calorimetry 54 (1998), S. 25-34 
    Details
    ISSN: 1572-8943
    Keywords: activation energy ; kinetic equation ; oxidation ; vanadium oxides ; Zhuravlev equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract It has been found that the modified Zhuravlev equation, [(1−α)−1/3−1]2=ktn, which describes the kinetics of oxidation of V2O4 and V6O13 in the temperature range 820–900 K and in the oxygen pressure range 1.0–20 kPa, can be derived via the assumption that the changes in the observed activation energy result from the changing contributions of the two diffusion processes controlling the reaction rate. The values of the observed activation energy are in the range 160–175 kJ mol−1 for V2O4 and 188–201 kJ mol−1 for V6O13 in the scope of the experimental oxygen pressures and temperatures and conversion degrees of 0.1–0.9.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010144213799
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of the Kinetic Parameters of Chemical Reactions on the Basis of Non-Isothermal Measurements A critical review (1998)
    Springer
    Journal of thermal analysis and calorimetry 54 (1998), S. 399-406 
    Details
    ISSN: 1572-8943
    Keywords: activation energy ; kinetics ; non-isothermal measurements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A detailed analysis is presented of the applicability of several dependences commonly used for the determination of activation energies from non-isothermal measurements. Reactions proceeding according to different kinetic equations are simulated and the validity of the activation energy values obtained is discussed. The general conclusion is drawn that none of the examined dependences should be used to determine the activation energy. For a rough estimation of activation energy, the Kissinger equation can be applied according to Ockham's razor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010143019676
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A study of short-range correlation effects on nuclear spatial and momentum distribution (1987)
    Springer
    The European physical journal 328 (1987), S. 393-397 
    Details
    ISSN: 1434-601X
    Keywords: 21.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The relation between the nuclear spatial and momentum densities is studied by means of their integral representations in terms of uniform distributions. Examples of this approach are given for the harmonic oscillator model of4He and16O, with and without Jastrow correlations, and for the single-particle potential model of40Ca.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289624
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The Detailed Mechanism of Oxidation of Ni-P Alloys (1999)
    Springer
    Journal of thermal analysis and calorimetry 55 (1999), S. 981-987 
    Details
    ISSN: 1572-8943
    Keywords: nickel phosphates ; nickel phosphides ; Ni-P alloys ; oxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract DTA in conjuction with X-ray diffraction analysis with a high-temperature camera and infrared spectroscopy was employed to determine the mechanism of oxidation of Ni-P alloys. Amorphous Ni-P powders were obtained from a nickel(II) sulphate bath as a nickel source and sodium dihydrophosphate(I) as a reducing agent. The crystallization product is composed of two phases: (f.c.c.) Ni and (b.c.t.) Ni3P. The amorphous to crystalline transformation takes place in the temperature range 280–330°C. Ni3P samples were heated from room temperature to 1050°C in air atmosphere at 5°C min−1. It was found that the first stage of oxidation of Ni3P goes through the intermediate phase of Ni12P5 formation to Ni2P. Some exothermic reactions were observed. Heating runs were interrupted after each reaction for crystal structure determination by IR spectrometry. Infrared spectra are reported and it is shown that the structure units present in the amorphous products at about 700°C were the oxoanions PO3 − and P2O7 −. The final products of the oxidation process are NiO and Ni3(PO4)2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010106506249
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    Paper (German National Licenses)
    Fulltext
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