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'Thermal Decomposition' in keywords Facet   Publication Year 2000  [X]
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1Author    Hidenari Inoue3, Shuichi Narino3, Naoki Yoshioka3, Ekkehard FluckbRequires cookie*
 Title    Thermal Decomposition of Prussian Blue Analogues of the Type Fe[Fe(CN)5NO]  
 Abstract    The structure and properties o f the thermal decomposition products of Fe[Fe(CN)sNO] • x H2O (x = 5 ~ 6) have been studied by M össbauer and FT-IR spectroscopy, X-ray diffraction, and conductivity measurements. The valence state and coordination environment of the iron ions change dramatically when the nitrosyl ligand is eliminated by heat-treatment under vacuum at 200 °C. The dark blue product obtained by heat-treatment under vacuum at 250 °C is characteristic of the mixed-valence state in Prussian blue analogues. The electrical conductivity of the dark blue product is higher by a factor o f 103 than that o f the starting material because of the mixed-valence state between Fe(III)[Fe(II)(CN)5] and Fe(II)[Fe(III)(CN)5]. Heat-treatment under vacuum at 350°C yields a new product Fe(II)[Fe(II)(CN)4] the crystal structure of which is different from that of the starting material. The electrical conductivity of the decomposition product obtained at 350 °C is about 105 times higher than that of the starting material. 
  Reference    Z. Naturforsch. 55b, 685—690 (2000); received April 5 2000 
  Published    2000 
  Keywords    Prussian Blue Analogues, Mixed-Valence State, Thermal Decomposition 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0685.pdf 
 Identifier    ZNB-2000-55b-0685 
 Volume    55 
2Author    C. Hennig, H. OppermannRequires cookie*
 Title    Thermische Zersetzung und Lösungskalorimetrie von Ammoniumneodymiodiden Thermal Decomposition and Solution Calorimetry of Ammonium Neodymium Iodides  
 Abstract    The thermodynamical data of ammonium neodymium iodides (N H 4)3N dI6 and (NH4)2NdI5 were derived by the determination of their decomposition equilibria by total pressure measurements. Moreover, solution calorimetry was applied. The enthalpies of for­ mation of these phases were calculated from their heats of solution and from the enthalpies of formation and the heats of solution of N dl3 and NH4I in 4n HI (aq.) at 298 K. Data by total pressure measurement: ZlH ^(N H 4),N dI6f298) = -306,7 ± 4,9 kcal/mol; S°((NH4)3NdI6f298) = 152,8 ± 5,7 cal/K-mol; Z)H ^(NH 4)-,N d i,f,98) = -260,9 ± 4,2 kcal/mol; S°((NH4)2N dI3,f,298) = 114,3 ± 4,7 cal/K-mol. Data by solution calorimetry: ZlHß(Ndl3 f 298) = -154,3 ± 2,0 kcal/mol; z!HB((NH4j,N dI6f298) = -299,6 ± 3,2 kcal/mol; /1H^((NH4)2NdIsf998) = -255,2 ± 2,8 kcal/mol. 
  Reference    (Z. Naturforsch. 55b, 65—73 [2000]; eingegangen am 14. O ktober 1999) 
  Published    2000 
  Keywords    Ammonium Neodymium Iodides, Neodymium Iodide, Thermal Decomposition, Thermodynamical D ata Solution Calorimetry 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0065.pdf 
 Identifier    ZNB-2000-55b-0065 
 Volume    55