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Mass Spectrometric Investigation of the Evaporation Properties of Lead Oxide

✍ Scribed by A. Popovič; A. Lesar; M. Guček; L. Bencze

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
232 KB
Volume
11
Category
Article
ISSN
0951-4198

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✦ Synopsis

Partial pressures of molecular species over solid PbO were measured in the temperature interval between 890 K and 1100 K using Knudsen-cell mass spectrometry. The assignment of ions is discussed in detail. Structural and vibrational parameters of the gas phase for (Pb n O n ) (n = 1,2,3,4) were calculated by the ab initio molecular orbital method at different approximation levels. Third law enthalpies of dissociation of Pb 2 O 2 and Pb 4 O 4 to monomeric PbO were obtained as (250.6 ± 6) kJ/mol and (835.0 ± 15) kJ/mol, respectively. The possibility of direct measurement of the dissociation pressure of PbO by a mass spectrometer is demonstrated.

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