Thermodynamics of strontium molybdate sublimation

Kazenas, E. K.; Tsvetkov, Yu. V.; Samoilova, I. O.; Astakhova, G. K.; Volchenkova, V. A.

doi:10.1134/s0036029508020031

Cited by 14 publications

(2 citation statements)

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“…At 2000 K the vapor pressure is ~ 5.9 × 10 -6 bars and the vapor is dominantly composed of Mg (61%), O2 (24%), O (13%), and MgO (2%). The measurements (blue points) of Kazenas et al (1983) and the calculations (green points) of Krieger (1966a) agree with the IVTAN calculations (black curve) for the vapor pressure.…”

Section: Periclase (Mgo)supporting

confidence: 70%

“…We compare the IVTAN code calculations for vapor pressures of the pure oxides to representative values from other calculations and measurements where data are available. Vapor pressures were measured by Knudsen effusion mass spectrometry (KEMS, Chervonnyi et al 1977, Drowart et al 1960, Grimley, Burns & Ingrham 1961, Kazenas et al 1983, 1985, Kazenas & Tagirov 1995, Samoilova & Kazenas 1995 and manometry (Salmon 1961). Oxygen fugacities (partial pressures) were measured using solid-state zirconia sensors (Blumenthal & Whitmore 1961, Jacobsson 1985, O'Neill 1988, O'Neill & Pownceby 1993.…”

Section: Vapor Pressure and Solubility In Steam Of Sio2 Mgo And Fe Ox...mentioning

confidence: 99%

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Solubility of Rock in Steam Atmospheres of Planets

Fegley¹,

Jacobson

Williams³

et al. 2016

ApJ

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Extensive experimental studies show all major rock-forming elements (e.g., Si, Mg, Fe, Ca, Al, Na, K) dissolve in steam to a greater or lesser extent. We use these results to compute chemical equilibrium abundances of rocky element -bearing gases in steam atmospheres equilibrated with silicate magma oceans. Rocky elements partition into steam atmospheres as volatile hydroxide gases (e.g., Si(OH)4, Mg(OH)2, Fe(OH)2, Ni(OH)2, Al(OH)3, Ca(OH)2, NaOH, KOH) and via reaction with HF Friday, March 25, 2016 Bruce Fegley, Jr. 2 2 and HCl as volatile halide gases (e.g., NaCl, KCl, CaFOH, CaClOH, FAl(OH)2) in much larger amounts than expected from their vapor pressures over volatile-free solid or molten rock at high temperatures expected for steam atmospheres on the early Earth and hot rocky exoplanets. We quantitatively compute the extent of fractional vaporization by defining gas/magma distribution coefficients and show Earth's subsolar Si/Mg ratio may be due to loss of a primordial steam atmosphere. We conclude hot rocky exoplanets that are undergoing or have undergone escape of steambearing atmospheres may experience fractional vaporization and loss of Si, Mg, Fe, Ni, Al, Ca, Na, and K. This loss can modify their bulk composition, density, heat balance, and interior structure.

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Section: Periclase (Mgo)supporting

confidence: 70%

Section: Vapor Pressure and Solubility In Steam Of Sio2 Mgo And Fe Ox...mentioning

confidence: 99%

Solubility of Rock in Steam Atmospheres of Planets

Fegley¹,

Jacobson

Williams³

et al. 2016

ApJ

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Mass spectrometric study and modeling of the thermodynamic properties in the Gd₂O₃‐ZrO₂‐HfO₂ system at high temperatures

Каблов

Шилов

Stolyarova

et al. 2022

Rapid Comm Mass Spectrometry

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Rationale: Materials based on the Gd 2 O 3 -ZrO 2 -HfO 2 system are promising for a wide range of high-temperature technological applications, such as for obtaining thermal barrier coatings in the aviation and space industry, as well as advanced materials in nuclear power applications. Experimental studies of the ceramics based on this system by the Knudsen effusion mass spectrometric method provides such valuable information as the vapor composition over the samples and enables derivation of the thermodynamic functions.Methods: Samples of ceramics in the Gd 2 O 3 -ZrO 2 -HfO 2 system were synthesized and analyzed by X-ray fluorescence and diffraction techniques. The vaporization processes and partial pressures of the vapor species over the samples were obtained by the high-temperature mass spectrometric method using the ion current comparison method. The derived thermodynamic functions were optimized within the Generalized Lattice Theory of Associated Solutions (GLTAS) approach.Results: At the temperature of 2600 K, the GdO, ZrO, ZrO 2 , HfO, and O vapor species were found over the samples, but only for the GdO and ZrO species were accurate experimental data on the partial pressures obtained. In all the ceramic samples, the Gd 2 O 3 activity was determined. On this experimental basis, modeling within the GLTAS approach was performed. It allowed the evaluation of the Gd 2 O 3 , ZrO 2 , and HfO 2 activities in the system under study and a rough approximation of the excess Gibbs energy as a function of composition to be obtained.Conclusions: At 2600 K the Gd 2 O 3 -ZrO 2 -HfO 2 system is characterized by negative deviations of its thermodynamic properties from the ideal behavior. Consistency of the obtained modeling results indicate reasonable uniformity of the energy parameters of the lattice model derived in calculations of the hafnia-containing oxide systems, which may be used in further modeling of multicomponent systems. | INTRODUCTIONA search for new compositions of the zirconia-hafnia ceramics stabilized by rare earth oxides is interesting, first of all, in view of the advantages they may provide when used as materials for thermal barrier coatings 1-6 and for casting moulds and cores in the production of gas turbine engine blades. [7][8][9] Investigation of the thermodynamic properties of the Gd 2 O 3 -ZrO 2 -HfO 2 ceramics in addition to the data

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High‐temperature mass spectrometric study of thermodynamic properties in the TiO₂–Al₂O₃–SiO₂ system and modeling

Stolyarova

Vorozhtcov

Shemchuk

et al. 2022

Rapid Comm Mass Spectrometry

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Rationale The TiO2–Al2O3–SiO2 system is the base for various glass–ceramic materials, which have great practical value for a large number of modern technologies. Many TiO2–Al2O3–SiO2 materials are synthesized or applied at high temperatures, which justifies the relevance of the present study. Methods The samples in the TiO2–Al2O3–SiO2 system were synthesized using the method of induction melting in a cold crucible. The thermodynamic properties of the TiO2–Al2O3–SiO2 system were studied using the Knudsen effusion mass spectrometric method. The derived thermodynamic functions were optimized within the generalized lattice theory of associated solutions (GLTAS) approach and compared with the results of calculation using the semiempirical Kohler, Muggianu, Toop, Redlich–Kister, and Wilson methods based on the corresponding data in the binary systems. Results The SiO2 selective vaporization from the samples under study was shown at temperatures above 1940 K. The thermodynamic properties in the TiO2–Al2O3–SiO2 system, including the TiO2–SiO2 system, were obtained in the temperature range 1965–2012 K and were optimized using GLTAS to obtain the consistent concentration dependences of the component activities and excess Gibbs energies. Conclusions Positive deviations from the ideal behavior were observed in the TiO2–Al2O3–SiO2 system at high temperatures. Comparison of these values with the results of the modeling based on the GLTAS approach allowed the recommendations regarding the optimal semiempirical methods for the excess Gibbs energy calculation in different concentration ranges to be made.

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Thermodynamics of strontium molybdate sublimation

Cited by 14 publications

References 1 publication

Solubility of Rock in Steam Atmospheres of Planets

Solubility of Rock in Steam Atmospheres of Planets

Mass spectrometric study and modeling of the thermodynamic properties in the Gd₂O₃‐ZrO₂‐HfO₂ system at high temperatures

High‐temperature mass spectrometric study of thermodynamic properties in the TiO₂–Al₂O₃–SiO₂ system and modeling

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Thermodynamics of strontium molybdate sublimation

Cited by 14 publications

References 1 publication

Solubility of Rock in Steam Atmospheres of Planets

Solubility of Rock in Steam Atmospheres of Planets

Mass spectrometric study and modeling of the thermodynamic properties in the Gd2O3‐ZrO2‐HfO2 system at high temperatures

High‐temperature mass spectrometric study of thermodynamic properties in the TiO2–Al2O3–SiO2 system and modeling

Contact Info

Product

Resources

About

Mass spectrometric study and modeling of the thermodynamic properties in the Gd₂O₃‐ZrO₂‐HfO₂ system at high temperatures

High‐temperature mass spectrometric study of thermodynamic properties in the TiO₂–Al₂O₃–SiO₂ system and modeling