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1998 (1)
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    C. Hennig, H. OppermannRequires cookie*
 Title    Thermische Zersetzung und Lösungskalorimetrie von Ammoniumneodymchloriden Thermal Decomposition and Solution Calorimetry of Ammonium Neodymium Chlorides  
 Abstract    The thermodynamical data of ammonium neodymium chlorides (NH4)2NdCl5 and NH4Nd2Cl7 were derived by the determination of their decomposition equilibria by total pres­ sure measurements. Moreover, solution calorimetry was applied. The enthalpies of formation of these phases were calculated from their heats of solution and from the enthalpies of formation and the heats of solution of NdCl3 and NH4C1. D ata by total pressure measurement: Z\H£((NH4)2NdCl5,f)298) = — 412,5 dh 3,6 kcal/mol; S°((NH4)2NdCl5 f 298) = 80,1 ± 5,8 cal/K m ol; Z\H£(NH4Nd2Cl7,f,298) = -579,5 ± 3,5 kcal/mol; S°(NH4Nd2Cl7,f,298) 101,8 ± 5,6 cal/K mol. D ata by solution calorim etry: 4H £(N dC l3;f,298) -251,2 ± 0,7 kcal/mol; /\H £((N H 4)2NdCl5,f,298) = -105,5 ± 1,0 kcal/mol; Z\Hß(NH4Nd2Cl7f 298) = -576,8 ± 1,7 kcal/mol. 
  Reference    Z. Naturforsch. 53b, 175—183 (1998); eingegangen am 16. Oktober 1997 
  Published    1998 
  Keywords    Ammonium Neodymium Chlorides, Neodymium Chloride, Thermodynamical Data, Solution Calorimetry, Heat of Solution 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0175.pdf 
 Identifier    ZNB-1998-53b-0175 
 Volume    53