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  • Inorganic Chemistry  (3)
  • 76.80  (1)
  • 1
    ISSN: 1432-0630
    Keywords: 61.80.Ba ; 52.75.-d ; 81.60.Bn ; 76.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Armco iron samples were surface nitrided by irradiating them with pulses of an excimer laser in a nitrogen atmosphere. The resulting nitrogen depth profiles measured by Resonant Nuclear Reaction Analysis (RNRA) and the phase formation determined by Conversion Electron Mössbauer Spectroscopy (CEMS) were investigated as functions of energy density and the number of pulses. The nitrogen content of the samples was found to be independent of the number of pulses in a layer of 50 nm from the surface and to increase in depths exceeding 150 nm. The phase composition did not change with the number of pulses. The nitrogen content can be related to an enhanced nitrogen solubility based on high temperatures and high pressures due to the laser-induced plasma above the sample. With increasing pulse energy density, the phase composition changes towards phases with higher nitrogen contents. Nitrogen diffusion seems to be the limiting factor for the nitriding process.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 338 (1965), S. 37-46 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Due to spectroscopic studies, the intermediates in the formation of the salts [Fe(L)6] [Fe4(CO)13], which are formed in the systems Fe(CO)5/pyridin and Fe(CO)5/morpholine, are probably soluble salts of the anions [Fe3(CO)11]2- (L = pyridine) and [Fe(CO)4]2- and [Fe3(CO)11]2- (L = formylmorpholine). In the systems Fe3(CO)12/ethylenediaminehydrate and Fe3(CO)12/liquid ammonia the hendecacarbonyltriferrate anion is converted at higher temperature to the octacarbonyldiferrate anion: 3[Fe(L)x][Fe3(CO)11] → 4[Fe(L)x][Fe2(CO)8] + 5 CO (x = 3, L = ethylenediamine; x = 6, L = ammonia).In the reaction of triiron-dodecacarbonyl with ethanol, salts of the hydrogenhendecacarbonyltriferrate are formed; according to the overall reaction 6 Fe3(CO)12 → [Fe(Alk.)x][Fe3(CO)11H]2 + 10 Fe(CO)5 + Fe(OC2H5)2. When the reaction temperature is raised these salts decompose completely yielding Fe(CO)5, instable Fe(OC2H5)2, CO and H2. Also with acetone Fe3(CO)12 reacts to [Fe(CO)11H]-
    Notes: Mit Hilfe der bekannten Absorptionsspektren mehrkerniger Carbonylferrate werden die früher präparativ untersuchten Reaktionen der Eisencarbonyle mit N- und O-Basen beobachtet, um näheren Einblick in den jeweiligen Reaktionsverlauf zu erhalten. In den Systemen Eisenpentacarbonyl/Pyridin oder Morpholin bilden sich die schwer löslichen Salze [Fe(L)6][Fe4(CO)13] wahrscheinlich über die Anionen [Fe3(CO)11]2- (L = Pyridin) bzw. [Fe(CO)4]2- und [Fe3(CO)11]2- (L = Formylmorpholin). In den Systemen Eisentetracarbonyl/Äthylendiaminhydrat oder flüss. Ammoniak wird bei Steigerung der Reaktionstemperatur das 3kernige Salz zum 2kernigen abgebaut, entsprechend 3[Fe(L)x][Fe3(CO)11] → 4[Fe(L)x][Fe2(CO)8] + 5 CO (x = 3. L = Äthylendiamin; x = 6, L = Ammoniak).Im abgeschlossenen System Eisentetracarbonyl/Äthylakohol erhält man nach spektroskopischen Untersuchungen über Teilvorgänge und Alkoholyse das lösliche Hydrogenhendekacarbonyltriferrat, gemäß der Bruttogleichung 6 Fe3(CO)12 \documentclass{article}\pagestyle{empty}\begin{document}$$ 3[{\rm Fe(L)}_{\rm x}][{\rm Fe}_{\rm 3} ({\rm CO})_{11}] \to 4[{\rm Fe(L}_{\rm x} {\rm)}][{\rm Fe}_{\rm 2} ({\rm CO})_8 + 5{\rm CO}] $$\end{document} [Fe(Alk.)x][Fe3(CO)11H]2 + 10 Fe(CO)5 + Fe(OC2H5)2, das sich bei höherer Temperatur vollständig in Fe(CO)5, labiles Fe(OC2H5)2, CO und H2 zersetzt. Auch im System Fe3(CO)12/Aceton bildet sich das Ion [Fe3(CO)11H]-.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 339 (1965), S. 224-224 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No. Abstract.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 338 (1965), S. 32-36 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The absorption spectra of the polynuclear carbonylferrate anions have been investigated in alkaline-water solution. The solution of the anions [Fe(CO)4H]- and [Fe2(CO)8]2- are not stable and decompose by irradiation with UV light giving the anion [Fe3(CO)11]2-. The hydrogentridecacarbonyltetraferrate-anion [Fe4(CO)13H]- has been also characterized by its absorption spectrum.
    Notes: Die früher beschriebenen Absorptionsspektren mehrkerniger Carbonylferrate in alkalisch-wäßriger Lösung wurden einer Überprüfung unterzogen. Reine Hydrogentetracarbonylferrat- und Oktacarbonyldiferrat-Lösungen mit den Anionen [Fe(CO)4H]- und [Fe2(CO)8]2- erhält man nur unter Rotlicht, während beim Bestrahlen mit UV-Licht z. T. Oxydation über [Fe3(CO)11]2- bis zum Fe(OH)2 erfolgt. Erstmals wurde auch das Hydrogentridekacarbonyltetraferrat-Ion [Fe4(CO)13H]- durch sein Absorptionsspektrum charakterisiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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