High temperature mass spectrometric investigation of the equilibrium vapor composition over three-component mixtures of CsI, NaI, and DyI/sub 3/
Journal Article
·
· High Temp. Sci.; (United States)
OSTI ID:6056915
The molar composition of the saturated vapor phase over ternary iodides of CsI, NaI, and DyI/sub 3/ at 860 to 1060 K was investigated by means of a mass spectrometer equipped with a Knudsen cell evaporator system. Fragmentation patterns and appearance potentials for the most intense ions were determined. Besides the previously detected fragments in the equilibrium vapor above the two-component systems, fragment ions from the complex molecules NaCsDyI/sub 5/, Na/sub 2/CsDyI/sub 6/, NaCs/sub 2/DyI/sub 6/, and Na/sub 3/Cs/sub 2/DyI/sub 8/ were found. Ion current vs temperature data yielded heats of sublimation: ..delta..H/sub s/ (NaCsDyI/sub 5/)/sub 960K/ = 320 +/- 13 kJ/mol; ..delta..H/sub s/ (Na/sub 2/CsDyI/sub 6/)/sub 960K/ = 325 +/- 11 kJ/mol; ..delta..H/sub s/ (NaCs/sub 2/DyI/sub 6/)/sub 960K/ = 348 +/- 15 kJ/mol; and ..delta..H/sub s/ (Na/sub 3/Cs/sub 2/DyI/sub 8/)/sub 960K/ = 366 +/- 17 kJ/mol. From the various high-temperature equilibrium reactions, one may calculate the following heats of formation: ..delta..H/sub f/ (NaCsDyI/sub 5/)/sub g/ = -863 +/- 23 kJ/mol; ..delta..H/sub f/ (Na/sub 2/CsDyI/sub 6/)/sub g/ = -1170 +/- 31 kJ/mol; ..delta..H/sub f/ (NaCs/sub 2/DyI/sub 6/)/sub g/ = -1235 +/- 33 kJ/mol; and ..delta..H/sub f/ (Na/sub 3/Cs/sub 2/DyI/sub 8/) = -1806 +/- 17 kJ/mol.
- Research Organization:
- Eotvos Lorand Univ., Budapest, Hungary
- OSTI ID:
- 6056915
- Journal Information:
- High Temp. Sci.; (United States), Journal Name: High Temp. Sci.; (United States) Vol. 18:2; ISSN HITSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
CESIUM COMPOUNDS
CESIUM IODIDES
DISPERSIONS
DYSPROSIUM
ELEMENTS
EQUILIBRIUM
FLUID FLOW
GAS FLOW
HALIDES
HALOGEN COMPOUNDS
INORGANIC PHOSPHORS
IODIDES
IODINE COMPOUNDS
KNUDSEN FLOW
MASS SPECTRA
MASS SPECTROMETERS
MASS SPECTROSCOPY
MEASURING INSTRUMENTS
METALS
MIXTURES
PHOSPHORS
PHYSICAL PROPERTIES
RARE EARTHS
SODIUM COMPOUNDS
SODIUM IODIDES
SPECTRA
SPECTROMETERS
SPECTROSCOPY
THERMODYNAMIC PROPERTIES
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
CESIUM COMPOUNDS
CESIUM IODIDES
DISPERSIONS
DYSPROSIUM
ELEMENTS
EQUILIBRIUM
FLUID FLOW
GAS FLOW
HALIDES
HALOGEN COMPOUNDS
INORGANIC PHOSPHORS
IODIDES
IODINE COMPOUNDS
KNUDSEN FLOW
MASS SPECTRA
MASS SPECTROMETERS
MASS SPECTROSCOPY
MEASURING INSTRUMENTS
METALS
MIXTURES
PHOSPHORS
PHYSICAL PROPERTIES
RARE EARTHS
SODIUM COMPOUNDS
SODIUM IODIDES
SPECTRA
SPECTROMETERS
SPECTROSCOPY
THERMODYNAMIC PROPERTIES