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  • 1
    Electronic Resource
    Electronic Resource
    Internal Oxidation of Ce3+-BaTiO3 Solid Solutions (1997)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 80 (1997), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The reoxidation process in highly Ce3+-doped BaTiO3 ceramics was studied using TEM. Samples of two different types of solid solutions, Ba1−XCe3+XTi1−X/4(VTi)X/4O3 and Ba1−XCe3+XTi4+1−XTi3+XO3, were prepared by sintering oxide mixtures in air and in a reducing atmosphere, respectively. The solid solutions were reoxidized by annealing in air at high temperatures (1000°—1100°C). As a result of internal oxidation of Ce3+ and Ti3+, fluorite CeO2 and monoclinic Ba6Ti17O40 phases were precipitated in the perovskite matrix. In Ba1−XCe3+XTi1−X/4(VTi)X/4O3 solid solution precipitates nucleate heterogeneously at grain boundaries and at extended defects inside the grains, whereas in Ba1−XCe3+XTi4+1−XTi3+XO3 solid solution precipitates are nucleated mainly homogeneously inside reoxidized perovskite grains. The form of the precipitates and their orientational relationship with the matrix, as well as the mechanism of internal oxidation, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1997.tb02789.x
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  • 2
    Electronic Resource
    Electronic Resource
    Solid Solubility of Neodymium in BaCeO3 (1997)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 80 (1997), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Incorporation of Nd into the BaCeO3 perovskite structure was studied by quantitative wavelength dispersive spectroscopy-electron probe microanalysis (WDS/EPMA) in combination with scanning electron microscopy (SEM) and X-ray powder diffractometry (XRPD). Highly Nd-doped BaCeO3 specimens, synthesized by mixed oxide technology, were sintered at 1400°C in ambient air. Concentrations of cations obtained by microanalysis were calculated to the ABO3 perovskite formula, considering incorporation of Nd at Ba as well as at Ce sites. Nd-BaCeO3 solid solutions may be represented by the general formula Ba1−XNdXCe1−YNdYO3−(Y-X)/2(VO)(Y-X)/2. The ratio between Nd incorporated at Ba sites and at Ce sites (X/Y) is a function of the starting composition, changing from 1 in the CeO2-rich part of the BaO-CeO2-Nd2O3 system, to ~0.1 in the BaO-rich part of the system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1997.tb03243.x
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  • 3
    Electronic Resource
    Electronic Resource
    Defect Structure and Electrical Properties of La1−ySryFe1−xAlxO3−δ (2001)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 84 (2001), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: La1−ySryFe1−xAlxO3−δ perovskites were studied as potential materials for solid-oxide fuel cell (SOFC) cathodes. The phase relations in the LaFeO3–SrFeO3−δ–LaAlO3 system were investigated by X-ray powder diffraction analysis. The defect structure of the La1−ySryFe1−xAlxO3−δ perovskites was investigated by Mössbauer spectroscopy and weight-loss analysis. Relations between the nonstoichiometry and the conductivity of the La1−ySryFe1−xAlxO3−δ perovskites were investigated. The incorporation of aluminum (x) into LaFe1−xAlxO3 was found to have no influence on the defect structure but to decrease the conductivity. The incorporation of strontium (y) into La1−ySryFe1−xAlxO3−δ promotes the formation of anion vacancies and Fe4+ that lead to higher conductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2001.tb00803.x
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructural Development in SnO2-Doped ZnO–Bi2O3 Ceramics (2000)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 83 (2000), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The effects of adding small quantities of SnO2 to the basic ZnO–Bi2O3 varistor composition were studied in terms of phase reactions, microstructural development, and the formation of inversion boundaries. Scanning and transmission electron microscopy studies showed that the inversion boundaries, triggered by the addition of SnO2, cause anisotropic grain growth in the early stages of sintering. ZnO grains that include inversion boundaries grow exaggeratedly, at the expense of normal grains, until they dominate the microstructure. Higher additions of SnO2 lead to an increase in number of grains with inversion boundaries and to a more fine-grained microstructure. The increasing amount of secondary phases is also related to a higher level of SnO2 addition; however, the influence of these phases on ZnO grain growth is subordinate to the role of inversion boundaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2000.tb01699.x
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  • 5
    Electronic Resource
    Electronic Resource
    Phase equilibria in the RuO2−Bi2O3−CdO−Nb2O5 system (1989)
    Springer
    Journal of materials science 24 (1989), S. 1904-1906 
    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 Interactions between the conductive phase in thick-film resistor materials (RuO2 and Bi2Ru2O7) and TCR modifiers (CdO and Nb2O5) were studied. Phase equilibria in the RuO2−Bi2O3−CdO, RuO2−Bi2O3−Nb2O5 and RuO2−CdO−Nb2O5 systems were examined. The lines in the systems were established. The existence of a solid solution of composition Bi 2−x Cd x Ru2O 7−x/2 was confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02385396
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  • 6
    Electronic Resource
    Electronic Resource
    Die Reduktion von Ammoniumpolyuranat zu Urandioxid (1967)
    Springer
    Monatshefte für Chemie 98 (1967), S. 1866-1872 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract The isothermal decomposition and reduction of ammonium polyuranate (ADU) was investigated in the temperature interval 285–463° C in hydrogen. The formation of UO3 was noticed below 290° C and this product was stable up to 320° C. U3O8 was stable from this temperature on up to 380° C, where the reduction to UO2 was observed. The activation energies 32,2 Kcal/mole and 41.7 Kcal/mole were calculated for the reduction of UO3 to U3O8 and for the reduction of U3O8 to UO2, respectively. The results are comparable with the published data on reduction of separate phases UO3 and U3O8. Some differences noticed show the influence of the activities of the products.
    Notes: Zusammenfassung Es werden die Resultate des isothermen Zerfalles und der Reduktion vonstandardisiertem Ammoniumpolyuranat im Bereich von 285 bis 463° C (in Wasserstoff) wiedergegeben. Der Zerfall zu UO3 wurde schon bei einer Temp. unter 290° C festgestellt, diese Phase blieb jedoch darauf stabil bis 320° C. Zwischen 320° C und 380° C verläuft die Reduktion zu U3O8, über 380° C aber zu UO2. Die Aktivierungsenergien bei der Reduktion von UO3 zu U3O8 und von U3O8 zu UO2 wurden berechnet, und zwar 32,2 kcal/g-mol und 41,7 kcal/g-mol. Die Ergebnisse können mit den Literaturangaben für die Reduktion der einzelnen Phasen UO3 und U3O8 verglichen werden. Die beobachteten Unterschiede weisen auf den Einfluß der Aktivität der Präparate hin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01167145
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  • 7
    Electronic Resource
    Electronic Resource
    Pressureless sintering of aluminium nitride to high density (1973)
    Springer
    Journal of materials science 8 (1973), S. 136-137 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00755592
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  • 8
    Electronic Resource
    Electronic Resource
    Investigation in the Al2O3-Bi2O3-CuO system (1984)
    Springer
    Journal of materials science 3 (1984), S. 659-662 
    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/BF00719916
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  • 9
    Electronic Resource
    Electronic Resource
    Phase equilibria in the 637-1637-1637-1system (1988)
    Springer
    Journal of materials science 7 (1988), S. 637-638 
    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/BF01730319
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  • 10
    Electronic Resource
    Electronic Resource
    Interactions of some thick-film components with alumina substrates (1989)
    Springer
    Journal of materials science 8 (1989), S. 961-962 
    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/BF01729960
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