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1998 (2)
1997 (2)
1Author    H. Oppermann, S. Ehrlich, C. HennigRequires cookie*
 Title    Calorimetrie an Yttriumtrihalogeniden und Yttriumoxidhalogemden Calorimetry of Yttrium Trihalides and Yttrium Oxyhalides  
 Abstract    The heats of solution of Yttrium, YOC1, YOBr, YOI, YC13, YBr3, YI3 and Y20 3 were determined in 4n HX. From those the enthalpies of formation of Yttrium Trihalides YX3 and Yttrium Oxyhalides YOX at 298 K were derived: Z\Hb(YC13j 298) = -2 4 0 .4 ± 0.6 kcal/mol, Z\H^(YBr3,f,298) = -2 0 2 .1 ± 1.5 kcal/mol, _\H £(YI3,f '298) = -147.0 ± 1.7 kcal/mol, ^ H ^ (Y O c if,298) = -2 4 0 .2 ± 1.0 kcal/mol. _AHß(YOBrf 298) = -229.7 ± 2.0 kcal/mol, AH 
  Reference    Z. Naturforsch. 52b, 305—310 (1997); eingegangen am 28. November 1996 
  Published    1997 
  Keywords    Synthesis, Yttrium Oxyhalides, Yttrium Halides, Heat of Solution, Enthalpy of Formation 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0305.pdf 
 Identifier    ZNB-1997-52b-0305 
 Volume    52 
2Author    S. Ehrlich, H. Oppermann, C. HennigRequires cookie*
 Title    Calorimetrie an Ammoniumyttriumhalogeniden Calorimetry of Ammonium Yttrium Halides  
 Abstract    The heat o f solution of all solid phases in the system YX3-NH4X with X = Cl, Br, I in 4 n HX was investigated. The enthalpies of formation of the ammonium yttrium halides are derived from the enthalpies of formation of Y X 3 and of NH4X and their heats of solution in An HX: Z\H^(NH4 Y 2Cl7,f,298) = — 561,5 ± 1,7 kcal/mol, Z\H^((NH4)3 YCl6,f,298) = -474,5 ± 1,3 kcal/mol, ziH ß((N H 4)3YBr6 f 298) = -400,8 ± 2,6 kcal/mol, _AH£((NH4)3 YI6,t-298) = -291,9 ± 3,0 kcal/mol. 
  Reference    Z. Naturforsch. 52b, 311—314 (1997); eingegangen am 24. Januar 1997 
  Published    1997 
  Keywords    Synthesis, Ammonium Yttrium Halides, Ammonium Halides, Heat of Solution, Enthalpy of Formation 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0311.pdf 
 Identifier    ZNB-1997-52b-0311 
 Volume    52 
3Author    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 
4Author    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