Thermodynamic properties of the UO2ZrO2 system studied by the isothermal mass spectrometric vaporization method

Stolyarova, V. L.; Шилов, А. Л.; Shultz, M. M.

doi:10.1016/s0022-3115(97)00029-9

Cited by 12 publications

(16 citation statements)

References 4 publications

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“…In this connection the vaporization processes and thermodynamic properties of the UO 2 -ZrO 2 system and components in the various concrete compositions were studied at high temperatures [3,48,88]. Investigations of interactions processes of SrO with various oxide materials by high temperature mass spectrometric method allowed to suggest the composition of oxide material for the trap of nuclear reactor that was also patented in Russia [89] and Finland [90].…”

Section: Application Of the Approaches Discussed For The Development mentioning

confidence: 99%

High Temperature Mass Spectrometric Study of Thermodynamic Properties and Vaporization Processes of Oxide Systems: Experiment and Modeling

Stolyarova¹

2013

TOTHERJ

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Abstract:The unique opportunities and features of high temperature mass spectrometric method for study vaporization processes and thermodynamic properties of oxide systems and materials (glasses, ceramics and coatings) were considered. Various types of vapour species were found over oxide systems studied such as the associated, dissociated and polymerized products of vaporization. The regularities of the vaporization of the binary and multicomponent oxide systems according to the position of oxide modifier in the Periodic table of atoms were illustrated and discussed from the point of view of the acid-base concept. Results on determination of thermodynamic functions in oxide systems were considered taking into account the main requirements for the confirmation of their reliability. Thermodynamic functions of oxide systems studied showed various signs of the deviations from the ideality. The general lattice theory of associated solutions was used for the calculation of thermodynamic properties of the ternary silicate melts studied. Based on this theory the correlation between thermodynamic functions obtained in the systems under consideration and the number of various types of bonds formed in these melts was illustrated. Using this approach the different levels of deviations from the ideality in the melts studied were clarified. Examples of the practical applications of high temperature mass spectrometry for developing advanced materials were shown.

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Section: Application Of the Approaches Discussed For The Development mentioning

confidence: 99%

High Temperature Mass Spectrometric Study of Thermodynamic Properties and Vaporization Processes of Oxide Systems: Experiment and Modeling

Stolyarova¹

2013

TOTHERJ

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“…in ZrO 2 -UO 2 system [12], 1460-1473 K in ZrO 2 -PuO 2 system [2,14] and 1290-1310 K in ZrO 2 -CeO 2 system [15]. A phase equilibrium study for CeO 2 -ThO 2 -ZrO 2 system by Grover and Tyagi [22] implies that the eutectoid temperature in the ZrO 2 -ThO 2 system is higher than that in the ZrO 2 -CeO 2 system.…”

Section: Zro 2 -Tho 2 Phase Diagrammentioning

confidence: 99%

“…Such oxides as ThO 2 , UO 2 , PuO 2 , and CeO 2 are well known materials relevant to nuclear fuel industry, and these oxides can form solid solution with monoclinic, tetragonal and cubic (fluorite) structures with ZrO 2 [1][2][3]. Knowledge in the phase equilibrium of these oxides with the ZrO 2 is of great importance for the nuclear fuels [2] and plutonium disposition [1,3], which involve such solid solutions as ZrO 2 -UO 2 [2], ZrO 2 -PuO 2 [3][4][5][6], ZrO 2 -ThO 2 -PuO 2 [1] and ZrO 2 -ThO 2 -CeO 2 [1].…”

Section: Introductionmentioning

confidence: 99%

Stability evaluation of fluorite structure phases in ZrO2-MO2 (M=Th, U, Pu, Ce) systems by thermodynamic modelling

Kinoshita

Uno

Yamanaka

2004

Journal of Alloys and Compounds

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“…Simultaneously, it was also confirmed that the UO 2 and ZrO 2 activities followed the ideal behavior within experimental uncertainties. A decrease in positive deviations from the ideal behavior in the UO 2 –ZrO 2 system with an increase in temperature was attributed 62 to attaining thermodynamic equilibrium of the solid solutions of this system, corresponding to the formation of the solution with cubic structure. Later, these data in the system under study were completely reproduced at both temperatures by Baïchi et al 63 using the same experimental approach, such as the Knudsen effusion mass spectrometric method.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to vaporization processes, the thermodynamic properties were studied for the first time using the Knudsen effusion mass spectrometric method in the UO 2 –ZrO 2 system by the complete isothermal vaporization approach 60,61 using two samples, with initial compositions containing 0.22 and 0.45 mole fractions of UO 2 , in the temperature range 2200–2650 K 62 . It was shown that at 2203 K in the solid solutions of this system, the UO 2 activities demonstrated positive deviations from ideality.…”

Section: Introductionmentioning

confidence: 99%

High‐temperature mass spectrometric study of thermodynamic properties in the UO₂–ZrO₂ system

Stolyarova

Vorozhtcov

Kurata

et al. 2020

Rapid Comm Mass Spectrometry

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Rationale The UO2–ZrO2 solid solution at high temperatures is the key system of modern nuclear science and technology in the context of the safety operation of nuclear cycles, the consequences of severe accidents, and the incorporation of nuclear waste. Urgent needs of the continuation of experimental studies of this system at temperatures up to 3000 K are aimed at preventing severe accidents similar to Chernobyl and Fukushima when the thermodynamic approach is used for the prediction of high‐temperature behavior of materials. Methods This investigation was carried out using the Knudsen effusion mass spectrometric method using the MS‐1301 magnetic sector mass spectrometer. The samples in the UO2–ZrO2 system were vaporized from a tungsten effusion cell. Vapor species effusing from the cell were ionized at an electron ionization energy of 70 eV. Results The vaporization and thermodynamics of pure UO2 and ZrO2 as well as of the samples in the UO2–ZrO2 system were studied in the range 2000–2730 K. The temperature dependences of the partial vapor pressures of UO and UO2 over pure UO2 were obtained at 2060–2456 K, which agreed with the literature results. The partial vapor pressures of UO, UO2, ZrO, and ZrO2, the vaporization rates, and the UO2 and ZrO2 activities in the UO2–ZrO2 solid solutions were determined at 2370, 2490, 2570, and 2730 K. Conclusions The component activities and excess Gibbs energies of the UO2–ZrO2 system indicated a change in deviations from the ideal behavior from positive to negative with the temperature increase from 2370 to 2730 K. The thermodynamic functions of formation from the oxides of the solid solutions in the UO2–ZrO2 system such as Gibbs energies as well as the enthalpies and entropies of formation were obtained for the first time at 2550 K in the composition range 0.89–1.00 ZrO2 mole fraction.

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Thermodynamic properties of the UO2ZrO2 system studied by the isothermal mass spectrometric vaporization method

Cited by 12 publications

References 4 publications

High Temperature Mass Spectrometric Study of Thermodynamic Properties and Vaporization Processes of Oxide Systems: Experiment and Modeling

High Temperature Mass Spectrometric Study of Thermodynamic Properties and Vaporization Processes of Oxide Systems: Experiment and Modeling

Stability evaluation of fluorite structure phases in ZrO2-MO2 (M=Th, U, Pu, Ce) systems by thermodynamic modelling

High‐temperature mass spectrometric study of thermodynamic properties in the UO₂–ZrO₂ system

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Thermodynamic properties of the UO2ZrO2 system studied by the isothermal mass spectrometric vaporization method

Cited by 12 publications

References 4 publications

High Temperature Mass Spectrometric Study of Thermodynamic Properties and Vaporization Processes of Oxide Systems: Experiment and Modeling

High Temperature Mass Spectrometric Study of Thermodynamic Properties and Vaporization Processes of Oxide Systems: Experiment and Modeling

Stability evaluation of fluorite structure phases in ZrO2-MO2 (M=Th, U, Pu, Ce) systems by thermodynamic modelling

High‐temperature mass spectrometric study of thermodynamic properties in the UO2–ZrO2 system

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High‐temperature mass spectrometric study of thermodynamic properties in the UO₂–ZrO₂ system