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  • 1980-1984  (4)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 17 (1984), S. 426-434 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A theoretical investigation is made into the vertical divergence effect of incident beams in the X-ray double-crystal arrangement, with dynamical diffraction effects taken into consideration. Equations describing the relation between the vertical divergence and the angular position of the second crystal under a condition of constant diffraction intensity are derived for the cases of parallel and non-parallel settings. These equations serve as a sufficient basis for explaining and analyzing problems relating to the vertical divergence effect.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 343-346 
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 23 (1982), S. 201-207 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Reaktion von Ammoniumsulfat mit Aluminiumoxid wurde untersucht. Durch Röntgendiffraktion und chemische Analyse wurde bestätigt, daß drei Zwischenprodukte (NH4)3Al(SO4)3, NH4Al(SO4)2 und Al2(SO4)3 gebildet werden. Die thermische Zersetzung der drei Verbindungen wurde durchgeführt. Es wurde gezeigt, daß für alle drei dasselbe Geschwindigkeitsgesetz Gültigkeit hat. Die Aktivierungsenergien für (NH4)3Al(SO4)3, NH4Al(SO4)2 und Al2(SO4)3 sind 95.9, 177.9 und 291.0 kJ/Mol.
    Abstract: Резюме Изучена реакция межд у сульфатом аммония и окисью алюминия. С пом ощью рентгено-диффракцио нного анализа и химич еского анализа подтвержден о образование трех промежуточных п родуктов реакции: (NH4)3Al(SO4)3, NH4Al(SO4)2 и Al2(SO4)3. Проведено термическое разложе ние этих трех соедине ний, и установлено, что для с облюдается один и тот же закон ско рости. Значения энерг ии активации соединени й (NH4)3Al(SO4)3, NH4Al(SO4)2 и Al2(SO4)3, соответстве нно, равны 95.9; 177.9 и 291.0 кдж. моль−1.
    Notes: Abstract The reaction between ammonium sulphate with aluminium oxide was studied. It was confirmed by X-ray diffraction and chemical analysis that three intermediate reaction products, (NH4)3Al(SO4)3, NH4Al(SO4)2 and Al2(SO4)3, are formed. The thermal decompositions of these three compounds were carried out. It has been shown that the same rate law is valid for them. The activation energies for (NH4)3Al(SO4)3, NH4Al(SO4)2 and Al2(SO4)3 are 95.9, 177.9 and 291.0 kj/mol, respectively.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 18 (1980), S. 501-508 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé On a étudié, par chromatographie en phase gazeuse, la cinétique de la décomposition thermique du composé d'addition du carbonate de potassium avec de l'eau oxygénée, en se servant d'un réacteur à écoulement, type lit fixe. Les résultats expérimentaux peuvent être décrits avec un bon ajustement dans tout l'intervalle de décomposition, par l'équation (I) -ln (1−α)=kt;α=degré de décomposition,t=temps (min) etk=constante de vitesse (min−1). L'énergie d'activation et le facteur préexponentiel sont pour 0〈α〈0.8, respectivement égaux à 74.3 et 7.8 · 109 kJ/mole, et pour la période d'amortissement (0.8 〈α〈1.0) à 77.3 et 1.38 · 1010 kJ/mole.
    Abstract: Zusammenfassung Die Kinetik der thermischen Zersetzung der Additionsverbindung von Kaliumcarbonat mit Wasserstoffperoxid wurde unter Anwendung eines Fixbett-Durchfluß-reaktors durch Gaschromatographie untersucht. Die Versuchsergebnisse können im ganzen Bereich der Zersetzung am besten durch die Gleichung (I) -ln (1−α)=kt beschrieben werden;α=Zersetzungsgrad,t=Zeit (min) undk=Geschwindigkeitskonstante (min−1). Die Aktivierungsenergie und der präexponentielle Faktor betragen, für 0〈α〈0.8, 74.3 kJ/Mol, bzw. 7.8 · 109 und für die Periode des Abklingens (0.8〈α〈1.0) 77.3 kJ/Mol, bzw. 1.38 · 1010.
    Notes: Abstract The kinetics of the thermal decomposition of the addition compound of potassium carbonate with hydrogen peroxide was carried out using a fixed bed flow reactor with gas-chromatography. The experimental results can be best represented over the whole range of the decomposition, by the equation-In (1−α)=kt, whereα=degree of decomposition,t=time (min.), andk=rate constant (min.−1). The activation energy and the pre-exponential factor for 0〈α〈0.8, are 74.3 kJ/mol and 7.8 · 109, and for the decay period (0.8〈α〈1.0), 77.3 kJ/mol and 1.38 · 1010, respectively.
    Type of Medium: Electronic Resource
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