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2001 (2)
1Author    F. Da Silva3, L. Rycerz3, M. Gaune-Escard3Requires cookie*
 Title    Calorimetric Investigation of MC1-EuCI2 Melts (M = Na, K, Rb)  
 Abstract    The molar enthalpies of mixing (A mixH m) of MCl-EuCl2 (M = Na, K, Rb) liquid binary systems were measured at 1138 K over the whole composition range by direct calorimetry. A Calvet type calorimeter was used, and mixing of the two liquid components was achieved by the ampoule break-off technique under argon at atmospheric pressure. The enthalpy of mixing of these systems is negative over the whole composition range with a minimum of approximately -0.5, -3.5 and -4.5 kJ mol-1 for M = Na, K, Rb, respectively. The least-squares coefficients A, B, C in the equation A (kJ mol-1) = A + B x + C x 2, where A is an interaction parameter, are reported. From the trend observed in these MCl-EuCl2 systems it was possible to estimate the mixing enthalpy of the CsCl-EuCl2 system. In tro d u c tio n 
  Reference    Z. Naturforsch. 56a, 653—657 (2001); received August 1 2001 
  Published    2001 
  Keywords    Mixing Enthalpy, Europium Dichloride, Alkali Chlorides, Calvet Calorimeter 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0653.pdf 
 Identifier    ZNA-2001-56a-0653 
 Volume    56 
2Author    S. A. Kuznetsov, L. Rycerza, M. Gaune-Escard3Requires cookie*
 Title    Electrochemical and Thermodynamic Properties of EuC13 and EuC12 in an Equimolar NaCl-KCl Melt  
 Abstract    The electroreduction o f EuCl3 in an equimolar NaCl-KCl mixture was studied at 973 -1123 K by different electrochemical methods. This reduction of Eu(III) in NaCl-KCl melt occurs via two successive reversible steps involving transfer o f one and two electrons. The diffusion coefficients of Eu(III) and Eu(II) were measured by linear sweep voltammetry and chronopotentiometry. The values found by these methods are in a good agreement. The standard rate constants for the redox reaction Eu(III) + e~ <=> Eu(II) were calculated from cyclic voltammetry data. The sluggish kinetics of this reaction is discussed in terms o f substantial rearrangement of the europium coordination sphere. Special attention was paid to the choice of working electrodes for the study o f electrode reactions. The formal standard potentials E*E u (^ /Ba, E* eU (hr/eu and the formal redox potentials ^*Eu(ni)/Eu(ii) were determined from open-circuit potentiometry and linear sweep voltammetry data. The free Gibbs energy changes for the reaction EuC13(so1) EuCl2(SO i.) + 1/2 Cl2(g.) and the equilibrium constants o f the metal-salt reaction 2Eu(III) + Eu 3 Eu(II) were calculated. The thermodynamics of the formation o f dilute solutions of europium di-and trichloride in an equimolar NaCl-KCl melt were determined. It was shown that electrochemical transient techniques give the possibility o f the determination of the relative partial molar mixing enthalpy of europium trichloride and dichloride in NaCl-KCl melt. 
  Reference    Z. Naturforsch. 56a, 741 (2001); received August 20 2001 
  Published    2001 
  Keywords    Europium, Molten Salts, Kinetics of Electrode Reaction, Formal Standard Potentials, Mixing Enthalpy 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0741.pdf 
 Identifier    ZNA-2001-56a-0741 
 Volume    56