NDLI: The thermodynamic parameters of monomer and dimer molecules of cerium and praseodymium tribromides

Content Provider	Springer Nature Link
Author	Motalov, V. B. Kryuchkov, A. S. Kudin, L. S. Grishin, A. E. Butman, M. F. Bergman, G. A.
Copyright Year	2008
Abstract	The method of high-temperature mass spectrometry is used for studying the composition of saturated vapor over cerium and praseodymium tribromides. Monomer and dimer molecules are found in the temperature ranges of 789–994 K and 804–957 K for cerium and praseodymium, respectively. The partial pressures of vapor components are determined, p(Pa), the temperature dependences of which are approximated by the equations $$ \begin{gathered} \log p(CeBr_3 ) = ( - 14.63 \pm 0.08) \times 10^3 /T + (14.54 \pm 0.09), T = 789 - 994 K; \enspace\enspace \\ \log p(Ce_2 Br_6 ) = ( - 19.72 \pm 0.61) \times 10^3 /T + (17.60 \pm 0.64), T = 918 - 980 K; \enspace\enspace \\ \log p(PrBr_3 ) = ( - 14.13 \pm 0.12) \times 10^3 /T + (14.09 \pm 0.14), T = 804 - 957 K; \enspace\enspace \\ \log p(Pr_2 Br_6 ) = ( - 18.90 \pm 0.50) \times 10^3 /T + (17.15 \pm 0.53), T = 903 - 955 K. \enspace\enspace \\ \end{gathered} $$ The values of pressure of vapor components are used along with literature data for the calculation of enthalpies of sublimation in the form of monomer and dimer molecules by the procedures of the second and third laws of thermodynamics. Based on analysis of the results, thermodynamic parameters of monomer and dimer molecules (in kJ mol−1) are recommended, $$ \begin{gathered} \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\Delta _s H^0 (CeBr_3 , 298.15) = 305 \pm 5, \Delta _s H^0 (PrBr_3 , 298.15) = 293 \pm 5, \enspace\enspace \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\Delta _s H^0 (Ce_2 Br_6 , 298.15) = 410 \pm 28, \Delta _s H^0 (Pr_2 Br_6 , 298.15) = 403 \pm 28, \enspace\enspace \\ \,\,\,\,\,\,\,\Delta _f H^0 (CeBr_3 , gas, 298.15) = - 587 \pm 6, \Delta _f H^0 (PrBr_3 , gas, 298.15) = - 597 \pm 7, \enspace\enspace \\ \Delta _f H^0 (Ce_2 Br_6 , gas, 298.15) = - 1372 \pm 28, \Delta _f H^0 (Pr_2 Br_6 , gas, 298.15) = - 1378 \pm 28. \enspace\enspace \\ \end{gathered} $$
Ending Page	356
Page Count	7
Starting Page	350
File Format	PDF
ISSN	0018151X
e-ISSN	16083156
Journal	High Temperature
Issue Number	3
Volume Number	46
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2008-05-30
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Atoms and Molecules in Strong Fields, Plasma Physics Mechanics, Fluids, Thermodynamics Materials Science Physical Chemistry Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Engineering Condensed Matter Physics

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