http://www.cnr.it/ontology/cnr/individuo/prodotto/ID53909
Thermodynamic study of sublimination of PbF2 and PbF4 from torsion-effusion vapor pressure measurements (Articolo in rivista)
- Type
- Label
- Thermodynamic study of sublimination of PbF2 and PbF4 from torsion-effusion vapor pressure measurements (Articolo in rivista) (literal)
- Anno
- 2010-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1021/je100260z (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- B. Brunetti. V. Piacente, P. Scardala (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- P. Scardala: Università La Sapienza
V. Piacente: Università La Sapienza (literal)
- Titolo
- Thermodynamic study of sublimination of PbF2 and PbF4 from torsion-effusion vapor pressure measurements (literal)
- Abstract
- The total vapor pressures of lead di- and tetrafluoride were measured by a torsion-effusion method. The vapor above PbF(2)(s) is prevalently PbF(2)(g). The temperature dependence of the vapor pressure is represented, in the temperature range (793 to 951) K, by the expression: log(p/Pa) = (12.76 +/- 0.10) - (10940 +/- 200)/(T/K). Treating the vapor pressures by the second and third laws, the sublimation enthalpy of PbF(2), Delta(sub)H(degrees)(298 K) = (225 +/- 5) kJ.mol(-1), was selected. Lead tetrafluoride decomposes according the reaction: PbF(4)(s) -> PbF(2)(s) + F(2)(g) (a). In the range (596 to 684) K, the temperature dependence of the fluorine pressure above PbF(4)(s) at near unit activity is represented by the expression: log(p/Pa) = (11.70 +/- 0.20) - (7450 +/- 200)/(T/K). In this temperature range, fluorine is partially dissociated so that, in addition to reaction a, the reaction 1/2 PbF(4)(s) -> 1/2 PbF(2)(s) + F(g) (b) was also studied. The second-law enthalpies at 650 K, Delta H degrees(650 K) = (141 and 152) kJ.mol(-1) associated to the reactions a and b, respectively, were obtained with an estimated error of 6 kJ.mol(-1) for both enthalpies. The entropy of PbF(4)(s), S degrees(650 K) = (272 +/- 15) J.K(-1).mol(-1) was also evaluated. (literal)
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