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1997 (1)
1Author    C. H. Ennig, H. O. Pperm, AnnRequires cookie*
 Title    Thermische Zersetzung und Lösungskalorimetrie von Ammoniumsamariumchloriden Therm al D ecom position and Solution C alorim etry of A m m onium Sam arium Chlorides  
 Abstract    We determined the decomposition equilibria of ammonium samarium chlorides (NH4)2SmCl5 and NH4Sm2Cl7 by total pressure measurements and derived their thermody­ namical data from the decomposition functions. The enthalpies of formation were compared with the results of the solution calorimetry. The heats of solution of all solid phases in the system SmCl3-NH4Cl and of Sm20 3 were measured in 4n HC1. The enthalpies of formation of ammonium samarium chlorides were derived from the enthalpies of formation of SmCl3 and of NH4C1 and their heats of solution. Data by total pressure measurement ZlHB((NH4)2SmCl5f298) =-407,7±2,9 kcal/mol; S0((NH4)2SmCl5x298) = 84,0 ±4,5 cal/K-mol; ZlHß((NH4)Srn2Ci7x298) = -576,8 ±3,4 kcal/mol; S0(NH4Sm2Cl7x298) = 98,l ±5,5 cal/K-mol. Data by solution calorimetry ZlH°B(SmCl3 f298) = -248,1 ±0,8 kcal/mol; zJHo B((NH4),Sm Cl,f298) = -40 4 ,3 ± l,l kcal/mol; ZlH°B(NH4Sm9Cl7 f 298)= -572,3± 1,8 kcal/mol. 
  Reference    Z. Naturforsch. 52b, 1517—1525 (1997); eingegangen am 29. September 1997 
  Published    1997 
  Keywords    Ammonium Samarium Chlorides, Samarium Chloride, Synthesis, Thermodynamical Data, Solution Calorimetry 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-1517.pdf 
 Identifier    ZNB-1997-52b-1517 
 Volume    52