Thermodynamics of vaporization of cesium molybdate by means of mass spectrometry

Yamawaki, Michio; Oka, Takashi; Yasumoto, Masaru; Sakurai, Hiroshi

doi:10.1016/0022-3115(93)90181-w

Cited by 23 publications

(9 citation statements)

References 6 publications

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“…Among the gaseous oxyacid salts, molybdates and tungstates constitute the largest and most extensively studied group . The molybdates and tungstates of alkali metals pass into vapor without decomposition . Gaseous molybdates and tungstates of polyvalent metals are formed from gaseous oxides as the result of reactions in a high‐temperature vapor .…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic properties of gaseous cerium molybdates and tungstates studied by Knudsen effusion mass spectrometry

Шугуров

Panin

Лопатин

2018

Rapid Comm Mass Spectrometry

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Section: Introductionmentioning

confidence: 99%

Thermodynamic properties of gaseous cerium molybdates and tungstates studied by Knudsen effusion mass spectrometry

Шугуров

Panin

Лопатин

2018

Rapid Comm Mass Spectrometry

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“…This can be related to the vaporization of Cs 2 ZrO 3 , which was added to the SFUO 2 sample, and which vaporizes incongruently to CsO and ZrO 2 [31]. Alternatively it could originate from Cs 2 MoO 4 , which vaporises congruently [37], as this compound was predicted to be stable by the thermochemical equilibrium calculations, also with no O 2 excess. This confirms the SEM-EDX observations of the aerosols that suggest a second source for the Cs release than CsI.…”

Section: Equilibrium Vaporization Studiesmentioning

confidence: 99%

Fission product partitioning in aerosol release from simulated spent nuclear fuel

Lemma

Colle

Rasmussen

et al. 2015

Journal of Nuclear Materials

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a b s t r a c tAerosols created by the vaporization of simulated spent nuclear fuel (simfuel) were produced by laser heating techniques and characterised by a wide range of post-analyses. In particular attention has been focused on determining the fission product behaviour in the aerosols, in order to improve the evaluation of the source term and consequently the risk associated with release from spent fuel sabotage or accidents. Different simulated spent fuels were tested with burn-up up to 8 at. %. The results from the aerosol characterisation were compared with studies of the vaporization process by Knudsen Effusion Mass Spectrometry and thermochemical equilibrium calculations. These studies permit an understanding of the aerosol gaseous precursors and the gaseous reactions taking place during the aerosol formation process.

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“…[16][17][18] Vaporization of cesium molybdate has been repeatedly investigated. [19][20][21][22][23] The standard enthalpies of formation of alkali metal molybdates, including cesium molybdate, obtained by the Knudsen effusion mass spectrometric method were summarized in a review. 2 Cesium molybdate was found to transfer into vapor congruently without dissociation.…”

Section: Vaporization Of Cs 2 Moomentioning

confidence: 99%

“…The vaporization enthalpy of solid Cs 2 MoO 4 was found to be 260.7 ± 7.1 kJ/mol at 1177.5 K, while that of molten Cs 2 MoO 4 was 231.8 ± 2.5 kJ/mol at 1237.5 K. 22 The study of cesium molybdate vaporization was carried out using the high-temperature mass spectrometric method also employing platinum cells by Kazenas et al 23 The…”

Section: Vaporization Of Cs 2 Moomentioning

confidence: 99%

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Vaporization and thermodynamics of the Cs₂O–MoO₃ system studied using high‐temperature mass spectrometry

Stolyarova

Vorozhtcov

Лопатин

et al. 2021

Rapid Comm Mass Spectrometry

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Rationale Cesium and molybdenum are fission products of uranium dioxide fuel in nuclear reactors, which interact with each other depending on the oxygen potential of the fuel. This leads to formation of various compounds of the Cs2O–MoO3 system, which are exposed to high temperatures during operation of a reactor or a severe accident at a nuclear power plant. This is why the study of the vaporization and thermodynamics of compounds in the Cs2O–MoO3 system is important. Methods Synthesis of the compounds in the Cs2O–MoO3 system was carried out by sintering Cs2MoO4 and MoO3. Characterization of the samples was accomplished with the use of XRD, TGA/DSC/DTA, IR spectroscopy, and ICP emission spectroscopy. Vaporization of the samples under study was carried out from a platinum effusion cell using an MS‐1301 mass spectrometer developed for high‐temperature studies of low‐volatility substances. Results The temperature dependences of partial pressures of vapor species were determined over pure MoO3 and Cs2MoO4 in the ranges 870–1000 K and 1030–1198 K, respectively. MoO3, Mo2O6, Mo3O9, Mo4O12, and Mo5O15 were shown to be the main vapor species over the Cs2O–MoO3 system in the temperature range 850–1020 K. The component activities, Gibbs energies of mixing, and excess Gibbs energies were obtained as functions of the component concentration at 900, 950, and 1000 K. Conclusions The thermodynamic properties of the Cs2O–MoO3 system found in the study evidenced negative deviations from ideality. The MoO3 and Cs2MoO4 partial molar enthalpies of mixing, the Cs2MoO4 partial vaporization enthalpy, and the total enthalpy of mixing in the Cs2O–MoO3 system at 1000 K were obtained for the first time.

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Thermodynamics of vaporization of cesium molybdate by means of mass spectrometry

Cited by 23 publications

References 6 publications

Thermodynamic properties of gaseous cerium molybdates and tungstates studied by Knudsen effusion mass spectrometry

Thermodynamic properties of gaseous cerium molybdates and tungstates studied by Knudsen effusion mass spectrometry

Fission product partitioning in aerosol release from simulated spent nuclear fuel

Vaporization and thermodynamics of the Cs₂O–MoO₃ system studied using high‐temperature mass spectrometry

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Thermodynamics of vaporization of cesium molybdate by means of mass spectrometry

Cited by 23 publications

References 6 publications

Thermodynamic properties of gaseous cerium molybdates and tungstates studied by Knudsen effusion mass spectrometry

Thermodynamic properties of gaseous cerium molybdates and tungstates studied by Knudsen effusion mass spectrometry

Fission product partitioning in aerosol release from simulated spent nuclear fuel

Vaporization and thermodynamics of the Cs2O–MoO3 system studied using high‐temperature mass spectrometry

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Vaporization and thermodynamics of the Cs₂O–MoO₃ system studied using high‐temperature mass spectrometry