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1Author    Fritz Seel, Fritz SchinnerlingRequires cookie*
 Title    Darstellung und thermische Zersetzung von Erdalkalimetall-Carbamoylphospliaten Preparation and Thermal Decomposition of Carbamoylphosphates of Alkaline-earth Metals  
 Abstract    After the formation of carbamoylphosphate through the reaction of KH2PO4 with KNCO in aqueous solution, unreacted phosphate and carbamoylphosphate can be separated by fractional precipitation with barium (first step) and calcium or strontium or barium salt solutions (second step) at low temperatures. The carbamoylphosphates of the alkaline earth metals are decomposed above 100 °C to yield predominantly diphosphates and urea. In aqueous suspensions the decomposition proceeds even at room temperature. -The chemical shifts of the phosphorus atom of the carbamoylphosphate ion between pH 6.5 and 8.2 are given. 
  Reference    Z. Naturforsch. 33b, 374—381 (1978); eingegangen am 31. Januar 1978 
  Published    1978 
  Keywords    Carbamoylphosphates, Preparation, Decomposition, NMR 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0374.pdf 
 Identifier    ZNB-1978-33b-0374 
 Volume    33 
2Author    CrI. Simionescu, S. Dumitriu, V. I. PopaRequires cookie*
 Title    im kalten Plasma The Mechanism and Kinetics of Methane-Water Mixture Decomposition in Cold Plasma  
 Abstract    In the present paper the mechanism and kinetics of methane-water mixtures decompo-sition in cold plasma are discussed. It was found that nature and composition of the products depend on reaction time, ratio of the two components, and how long the products are in contact after the decomposition was performed. Reactions in the decomposition system generally follow two mechanisms: corresponding to the discharge phase and to postreaction one. The highest yield of formaldehyde was obtained for the ratio methane water of 0.6-1 and two minutes of discharge. Die Bildung von Formaldehyd aus den hypothe-tischen Bestandteilen der Uratmosphäre wurde von LÖB 1 noch im Jahre 1906 in den dmch elektrische Entladungen in einer Mischung von Kohlendioxyd und Wasser entstandenen Produkten nachgewiesen. Später erwähnt derselbe Verfasser die Erzeugung von Glycin über Formaldehyd in einem aus Kohlen-mon-oder -dioxyd, Ammoniak und Wasser beste-henden System. Die Verwendung anderer Systeme (CO + H2; 
  Reference    (Z. Naturforsch. 31b, 466—471 [1976]; eingegangen am 5. November 1975) 
  Published    1976 
  Keywords    Methane-Water, Decomposition, Formaldehyde, Mechanism, Kinetics 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0466.pdf 
 Identifier    ZNB-1976-31b-0466 
 Volume    31 
3Author    H. Oppermann, M. Zhang, C. Hennig, HeinzDieter LutzRequires cookie*
 Title    Thermochemisches und kalorisches Verhalten von NdA^Cl^ Thermochemical and Calorical Behaviour of NdAl3C l12  
 Abstract    The thermodynamical data of solid and gaseous aluminium neodymium chloride have been obtained by determination of the decomposition equilibria (of solid) from total pressure mea­ surements and chemical transport reactions (gaseous). The melting diagram was determined by DTA. The enthalpy of formation of the solid phase was calculated from their heats of solution and from the enthalpies of formation and the heats of solution of NdCl3 and A1C13. Data by total pressure measurement: ^ H |(N d A l3Cl,2<f<298) = -749,6 ± 2,5 kcal/mol; S°(NdAl3C l12ifj298) = 118,2 ± 3,0 cal/K-mol. Data by solution calorimetry: zAHß(NdAl3C l|2 1298) = -748,6 ± 1,3 kcal/mol. Data by chemical transport: zAH£(NdAl3C l12>g,298) = -701,5 ± 3,0 kcal/mol; S°(NdAl3Cl12-g,298) = 215,0 ± 4,0 cal/K-mol. 
  Reference    Z. Naturforsch. 53b, 1343—1351 (1998); eingegangen am 21. Juli 1998 
  Published    1998 
  Keywords    Aluminium Neodymium Chloride, Decomposition, Thermochemical Data, Enthalpy, Entropy 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1343.pdf 
 Identifier    ZNB-1998-53b-1343 
 Volume    53 
4Author    M. Aria Maneva, M. Itko Georgiev, Norbert Lange, HeinzDieter LutzRequires cookie*
 Title    Zur Kenntnis von Berylliumiodat und -periodat - Röntgenographische, IR-und Raman-spektroskopische Untersuchungen On Beryllium Iodates and Periodates -X-Ray, IR , and R am an Studies  
 Abstract    Phase relationships and therm al decomposition of beryllium iodates and periodates were studied by X-ray and spectroscopic (IR, Ram an) measurements. B e(I03)2-4 H 20 , B e(I03)2, and Be(H4I 0 6)2-4 H 20 have been characterized. Be(H4I 0 6)2-4 H 20 (hitherto claimed in the lit­ erature to be a metaperiodate) dehydrates on heating with decomposition to form B e(I03)2. Anhydrous beryllium periodate was not obtained. On dehydration of B e(I0 3)2-4 H 20 , an­ hydrous B e(I03)2 is formed, which decomposes into BeO, I2, and 0 2 on further heating. 
  Reference    Z. Naturforsch. 46b, 795—799 (1991); eingegangen am 27. November 1990 
  Published    1991 
  Keywords    Iodates, Periodates, Beryllium, Decomposition, IR Spectra, Ram an Spectra 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-0795.pdf 
 Identifier    ZNB-1991-46b-0795 
 Volume    46