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1999 (1)
1998 (3)
1Author    Oppermann, S. Herrera, DaoQuoc HuongRequires cookie*
 Title    Untersuchungen zum chemischen Transport von YX3 mit A1X3 und zur Existenz von gasförmigen und festen Komplexen YA13 X12 (X = Br, I) Investigations on the Chemical Transport Reaction of YX3 with A1X3 and on the Existence of Gaseous and Solid Complexes YA13 X 12 (X = Br, I) H  
 Abstract    The dominant gaseous complexes YAl3B r12 and YA13I 12 were generated in the chemical trans­ port reactions of YBr3 with AlBr3 and YI3 with A1I3. The enthalpy of formation Z\H£(YAl3B r12,gi298) = -484,5 ± 6 kcal/mol and the standard entropy S°(YA13B 12 g 298) = 290,0 ± 7,5 cal/K mol have been calculated. It follows from total pressure measurements of mixtures of YBr3 s with AlBr3 1 and YI3 s with A1I3 b respectively, that complexes YAl3B r12 s and YA13I 12 s do not exist up to the boiling points of the aluminium trihalides. 
  Reference    Z. Naturforsch. 53b, 361—366 (1998); eingegangen am 1. Dezember 1997 
  Published    1998 
  Keywords    Chemical Transport Reaction, Yttrium Aluminium Halides, Enthalpy of Formation, Standard Entropy, Total Pressure Measurements 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0361.pdf 
 Identifier    ZNB-1998-53b-0361 
 Volume    53 
2Author    C. Hennig3, H. Oppermann, A. BlonskabRequires cookie*
 Title    Thermische Zersetzung und Lösungskalorimetrie von Ammoniumeuropiumchloriden Thermal Decomposition and Solution Calorimetry of Ammonium Europium Chlorides  
 Abstract    The thermal decomposition equilibria of ammonium europium chlorides (NH4)3EuCl6, (NH4)2EuC15 and NH4Eu2C17 have been investigated by total pressure measurements in a membrane zero manometer. The thermodynamic data of these solid phases have been deri­ ved from the decomposition functions. The standard enthalpies of solution in 4n HC1 (aq.) of (NH4)3EuC16, (NH4)2EuC15, NH4Eu2C17, EuC13 and Eu20 3 were measured. On the basis of these values and tabulated data, the standard enthalpies at 298 K of the ammonium europium chlorides were derived and compared with the obtained results from the total pressure measu­ rements. Data by total pressure measurement: 
  Reference    Z. Naturforsch. 53b, 1169—1179 (1998); eingegangen am 2. Juni 1998 
  Published    1998 
  Keywords    Ammonium Europium Chlorides, Europium Chloride, Thermal Decomposition, Standard Enthalpy of Formation, Standard Entropy 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1169.pdf 
 Identifier    ZNB-1998-53b-1169 
 Volume    53 
3Author    H. Oppermann, B. MarkleinRequires cookie*
 Title      
 Abstract    The heterogeneous reactions: 0 s 0 4 s = 0 s 0 4 g, 2 0 s 0 2,s = Oss + 0 s 0 4 g, Oss + 3 0 s 0 4 g = 4 0 s 0 3 g, 0 s 0 2s + 0 s 0 4 g = 2 0 s 0 3 g and the homogeneous reaction 0 s 0 4 " = 0 s 0 3 g + '/2 0 2 g were determined by total pressure measurements. From this and from chemical transport reactions of 0 s 0 2 and Os with Osmium tetroxide, the enthalpy of formation of gaseous 0 s 0 3 was computed to Z\H ß(0s03 g i98) = -40,0 ± 3 kcal/mol. 
  Reference    Z. Naturforsch. 53b, 1352—1364 (1998); eingegangen am 3. Juli 1998 
  Published    1998 
  Keywords    Osmium Oxides, Chemical Transport Reactions, Total Pressure Measurements, Enthalpy of Formation, Standard Entropy 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1352.pdf 
 Identifier    ZNB-1998-53b-1352 
 Volume    53 
4Author    C. Hennig, H. OppermannRequires cookie*
 Title    Thermische Zersetzung und Lösungskalorimetrie von Ammoniumneodymbromiden Thermal Decomposition and Solution Calorimetry of Ammonium Neodymium Bromides  
 Abstract    The thermal decomposition equilibria of ammonium neodymium bromides (NH4)3NdBr6, (NH4)2NdBr5 and NH4Nd2Br7 have been investigated by total pressure measurements. The thermodynamical data of these solid phase complexes have been derived from the decomposition functions. The standard enthalpies of solution in 4N HBr (aq.) of (NH4)3NdBr6, (NH4)2NdBr5, NH4Nd2Br7, NdBr3 and Nd20 3 were measured. On the basis of these values and tabulated data, the standard enthalpies at 298 K of the ammonium neodymium bromides were derived and compared with the results obtained from the total pressure measurements. Data by total pressure measurement: /\Hß((NH4)3NdBr6 f i98) = -399,1 ± 4,9 kcal/mol; S°((NH4)3NdBr6f298) = 153,4 ± 7,4 cal/K-mol; Z\H£((NH4)2NdBr5 f 298) = -343,0 ± 4,4 kcal/mol; S°((NH4),NdBr5 f ,98) = 109,9 ± 6 , 8 cal/K-mol; ^H ß(N H 4N d,Br7 f 298) = -484,0 ± 5,1 kcal/mol; S°(NH4Nd2Br7 ff<298) = 127,9 ± 6 , 6 cal/K-mol. Data by solution calorimetry: zAHß(NdBr3 , -> 98) = -208,7 ± 1,6 kcal/mol; ^\Hß((NH4)3-NdBr6 f 298) = -404,8 ± 2,7 kcal/mol; _\H^((NH4),NdBr5 f ,98) = -344,2 ± 2,4 kcal/mol; JkHß(NH4Nd2Br7 f 298) = -482,7 ± 3,7 kcal/mol. 
  Reference    Z. Naturforsch. 54b, 1283—1294 (1999); eingegangen am 22. Juli 1999 
  Published    1999 
  Keywords    Ammonium Neodymium Bromides, Neodymium Bromide, Thermal Decomposition, Standard Enthalpy of Formation, Standard Entropy 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1283.pdf 
 Identifier    ZNB-1999-54b-1283 
 Volume    54