Excess Molar Gibbs Free Energy of Solid {xKCl + (1 - x)KBr} at 820 K and Partial Pressures of Its Components Determined by Knudsen Effusion-Mass Spectrometry

1985 ◽  
Vol 89 (8) ◽  
pp. 916-920 ◽  
Author(s):  
M. Miller ◽  
K. Skudlarski
Keyword(s):  
Mass Spectrometry ◽  
Free Energy ◽  
Gibbs Free Energy ◽  
Molar Gibbs Free Energy ◽  
Knudsen Effusion ◽  
Partial Pressures ◽  
Knudsen Effusion Mass Spectrometry

scholarly journals Study of Molecular and Ionic Vapor Composition over CeI3by Knudsen Effusion Mass Spectrometry

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
A. M. Dunaev ◽  
V. B. Motalov ◽  
L. S. Kudin ◽  
M. F. Butman ◽  
K. W. Krämer
Keyword(s):  
Mass Spectrometry ◽  
Saturated Vapor ◽  
Ionic Composition ◽  
Electron Work Function ◽  
Negative Ions ◽  
Knudsen Effusion ◽  
Partial Pressures ◽  
Knudsen Effusion Mass Spectrometry ◽  
Enthalpies Of Sublimation ◽  
The Enthalpy Of Formation

The molecular and ionic composition of vapor over cerium triiodide was studied by Knudsen effusion mass spectrometry. In the saturated vapor over CeI3the monomer, dimer, and trimer molecules and the negative ions I−,CeI4-, andCe2I7-were identified in the temperature range of 753–994 K. The partial pressures of CeI3, Ce2I6, and Ce3I9were determined and the enthalpies of sublimation,ΔsH°(298.15 K) in kJ·mol−1, in the form of monomers (298±9), dimers (415±30), and trimers (423±50) were obtained by the second and third laws of thermodynamics. The enthalpy of formation,ΔfH°(298.15 K) in kJ·mol−1, of the CeI3(-371±9), Ce2I6(-924±30), and Ce3I9(-1585±50) molecules and theCeI4-(-857±19) andCe2I7-(-1451±50) ions were calculated. The electron work function,φe=3.3±0.3 eV, for the CeI3crystal was evaluated.

Vaporization and Thermochemical Study of SrCeO3(s) and SrCe0.95Yb0.05O3(s) by Knudsen Effusion Mass Spectrometry

2008 ◽  
Vol 138 ◽  
pp. 319-330
Author(s):  
Miroslav Miller ◽  
Aleksandra Matraszek
Keyword(s):  
Mass Spectrometry ◽  
Phase Field ◽  
Perovskite Phase ◽  
Thermochemical Study ◽  
Gaseous Species ◽  
Knudsen Effusion ◽  
Partial Pressures ◽  
Knudsen Effusion Mass Spectrometry ◽  
The Enthalpy Of Formation ◽  
Energy Of Formation

The vaporization of samples in the SrO-CeO2 system was investigated by the use of Knudsen effusion mass spectrometry in the temperature range of 1494 K – 1988 K. Partial pressures of the gaseous species O2, CeO2, Sr, and SrO were determined over the samples investigated. The partial pressures of the species were used for the evaluation of thermodynamic activities of CeO2 and SrO in the samples at 1800 K. The enthalpy of formation of SrCeO3(s) was obtained as fH°(298 K) = -1644 ± 21 kJ mol-1. The Gibbs energy of formation of SrCeO3(s) from SrO(s) and CeO2(s) resulted as fG°(1800 K) = -12.5 ± 2.8 kJ mol-1 for the phase field {SrCeO3 + ss of SrO in CeO2} and fG°(1800 K) = -13.7 ± 2.1 kJ mol-1 for the phase field {SrCeO3 + SrO}. The influence of the Yb concentration in the perovskite phase SrCe0.95Yb0.05O3 on the CeO2(s) activity was studied as well. The thermodynamic properties obtained in the present study are discussed on the basis of the data available in literature.

Vaporization studies on (manganese + tellurium) withx(Te) > 0.5 by Knudsen effusion mass spectrometry

2002 ◽  
Vol 34 (1) ◽  
pp. 103-117 ◽  
Author(s):  
T.S. Lakshmi Narasimhan, ◽  
M. Sai Baba, ◽  
R. Balasubramanian, ◽  
S. Nalini, ◽  
R. Viswanathan
Keyword(s):  
Mass Spectrometry ◽  
Knudsen Effusion ◽  
Knudsen Effusion Mass Spectrometry
Sign in / Sign up

Export Citation Format

Share Document