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Thermisches und kalorisches Verhalten von festem LaAl3Br12 und chemischer Transport von LaBr3 mit AlBr3 / Thermical and Calorical Behaviour of Solid LaAl3Br12 and Chemical Transport of LaBr3 with AlBr3
-
H. Oppermann
,
H. Dao Quoc
Published/Copyright:
June 2, 2014
Abstract
The thermodynamical data of solid Lanthanum Aluminium Bromide LaAl3Br12 have been obtained by determination of the decomposition equilibria from total pressure measurements. For different compositions LaBr3/AlBr3, the barogram of the binary system LaBr3-AlBr3 was constructed and from this and DTA the melting diagram was determined. The chemical trans port of LaBr3 with AlBr3 is suggesting the existence of two gaseous complexes LaAl3Br12 and LaAl2Br9.
The data are:
ΔH°B(LaAl3Br12,f,298) =-587,2 ± 7 kcal/mol, S°(LaAl3Br12,f,298) = 179,3 ± 7 cal/K·mol;
ΔH°B(LaAl3Br12,g,298) =-548,7 ± 5 kcal/mol, S°(LaAl3Br12,g,298) = 239,4 ± 6 cal/K·mol;
ΔH°B(LaAl2Br9,g,298) =-619,7 ± 5,5 kcal/mol, S°(LaAl2Br9,g,298) = 212,0 ± 7 cal/K·mol.
From solution calorimetric measurements follows the enthalpy of formation of the solid complexes: ΔH°B(LaAl3Br12,f,298) =-590,9 ± 3 kcal/mol.
Received: 2001-5-10
Published Online: 2014-6-2
Published in Print: 2001-9-1
© 1946 – 2014: Verlag der Zeitschrift für Naturforschung
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