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  • 1
    Electronic Resource
    Electronic Resource
    Crystal structure of nickel selenide - Ni3Se2 (1957)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 289 (1957), S. 203-206 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The crystal structure of Ni3Se2 has been determined from the X-ray powder diffraction pattern. The unit cell is rhombohedral with a = 4.24 Å, α = 90°38.6′, Z = 1, and space group R 32, D37. The observed and calculated intensities agree for the following arrangement - 2 Se at \documentclass{article}\pagestyle{empty}\begin{document}$ \frac{1}{4}\frac{1}{4}\frac{1}{4},\,\frac{3}{4}\frac{3}{4}\frac{3}{4} $\end{document} and 3 Ni at \documentclass{article}\pagestyle{empty}\begin{document}$ \frac{1}{2}\frac{1}{4}\frac{3}{4},\,\frac{3}{4}\frac{1}{2}\frac{1}{4},\,\frac{1}{4}\frac{3}{4}\frac{1}{2} $\end{document}.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19572890117
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  • 2
    Electronic Resource
    Electronic Resource
    Ein Fehlstellenüberstruktur-Modell für γ-Fe2O3 (1957)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 293 (1957), S. 228-232 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Auf Grund magnetischer und röntgenographischer Untersuchungen wird eine Fehlstellenüberstruktur für □-Fe2O3 entwickelt. Bei kubischer Symmetrie, Raumgruppe P43m, Td1, ist ein Eisen(III)-ion auf ½½½ von 4 Leerstellen auf Oktaederplätzen umgeben. Mit einem halben Mol Konstitutionswasser pro Elementarzelle ergibt sich die Formel Fe83+ [Fe123+ □ 4] Fe3+ (OH)-O312-.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19572930310
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  • 3
    Electronic Resource
    Electronic Resource
    X-ray photoelectron spectroscopic studies on ZnO/Bi2O3 varistors (1981)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 3 (1981), S. 142-145 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The intergranular layer and its microstructure, proposed earlier to behave non-linearly in the ZnO/Bi2O3 varistor ceramic system, has been studied by XPS. Our results clearly indicate the formation of an intergranular layer rich in Bi2O3 separating the semiconducting ZnO grains. With increase in sintering temperature, XPS results show the enrichment of the intergranular layer (Bi2O3 phase) without an additional phase being formed. The non-linear coefficient (α) in the current-voltage characteristic increases smoothly up to 1300°C. Afterwards, there is a loss of Bi ions from the Bi2O3 enriched intergranular phase resulting in the decrease of α, and in the characteristic XPS peak intensity.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740030308
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