Affiliation:
1. Institut für Anorganische Chemie der Technischen Universität, Mommsenstraße 13, D-01069 Dresden
Abstract
Abstract
The thermodynamical data of ammonium neodymium chlorides (NH4)2NdCl5 and NH4Nd2Cl7 were derived by the determination of their decomposition equilibria by total pressure 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 NH4Cl.
Data by total pressure measurement:
ΔH°B((NH4)2NdCl5,f,298) = - 412,5 ± 3,6 kcal/mol;
S°((NH4)2NdCl5 f 298) = 80,1 ± 5,8 cal/K · mol;
ΔH°B(NH4Nd2Cl7,f,298) = -579,5 ± 3,5 kcal/mol;
S°(NH4Nd2Cl7,f,298) 101,8 ± 5,6 cal/K mol.
Data by solution calorimetry:
ΔH°B(NdCl3,f,298) = -251,2 ± 0,7 kcal/mol;
ΔH°B((NH4)2NdCl5,f,298) = -405,5 ± 1,0 kcal/mol;
ΔH°B(NH4Nd2Cl7,f, 298) = -576,8 ± 1,7 kcal/mol.
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6 articles.
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