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  • 1
    Digitale Medien
    Digitale Medien
    Effect of High-Temperature Treatment on n–p Transition in Titania (2002)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: This paper reports the electrical conductivity and Seebeck coefficient (thermopower) values derived for TiO2 (rutile) at a temperature range of 923–1353 K and pO2 of 5 Pa–100 kPa. The effect of high-temperature treatment on the electrical properties of polycrystalline samples is discussed in terms of defect models. Samples sintered at ≥1573 K, as well as the single crystals, show n- to p-type transition, whereas samples sintered at 1473 K remain n-type throughout testing. No effect of grain size on thermopower is observed. These results are consistent with the defect disorder model assuming that titanium vacancies formed during high-temperature treatment (1473–1673 K) are frozen at the measuring temperature (923–1323 K).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00095.x
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  • 2
    Digitale Medien
    Digitale Medien
    Defect Chemistry of (La,Sr)MnO3 (1998)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 81 (1998), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: Defect-disorder models are derived for undoped and strontium-doped LaMnO3. A random-defect model and a cluster-defect model are both considered within the regimes that correspond to oxygen deficit and oxygen excess. The models are constructed based on the experimental nonstoichiometry data that was reported by previous researchers. According to both models, the addition of strontium leads to an increase of the concentration of electron holes and oxygen nonstoichiometry. The defect clusters that are predicted by the cluster model have a marked concentration only at very low oxygen partial pressures. Both models are verified against the electrical-conductivity data. A good agreement between the random-defect model and the experimental data is shown.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.1998.tb02297.x
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  • 3
    Digitale Medien
    Digitale Medien
    Grain Boundary Diffusion of Magnesium in Zirconia (2002)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: This paper reports the transport kinetics of Mg in cubic yttria-stabilized zirconia (containing 10% mol of Y2O3 (10YSZ)) involving the bulk and the grain boundary diffusion coefficients. The diffusion-controlled concentration profiles of Mg were determined using secondary ion mass spectrometry (SIMS) in the range 1073–1273 K. The determined bulk diffusion coefficient and the grain boundary diffusion product may be expressed as the following functions of temperature, respectively: D= 5.7 exp[(−390 kJ/mol)/RT] cm2·s−1 and D′αδ= 3.2 × 10−15 exp[(−121 kJ/mol)/RT] cm3·s−1, where α is the segregation enrichment factor and δ is the boundary layer thickness. The grain boundary enhancement factor decreases with temperature from 105 at 1073 K to 103 at 1273 K.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00442.x
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  • 4
    Digitale Medien
    Digitale Medien
    Kinetics of lithium evaporation from solid solutions of Li2O in NiO (1975)
    Springer
    Journal of materials science 10 (1975), S. 857-862 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Measurements of the kinetics of evaporation of Li2O from polycrystalline solid solutions of Li2O in NiO have been performed under varying temperatures (1340 to 1665 K) and solution concentrations (0.25 to 19.5 at.% Li). By taking into account the changes in specific surface area during annealing of the preparations, an equation has been derived describing the kinetics of the evaporation process.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01163080
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