Thermochemical properties of SrSiO(g) and SrBO2(g)

Asano, Masaharu; Kou, Tomoyuki

doi:10.1016/0021-9614(90)90116-8

Cited by 14 publications

(4 citation statements)

References 9 publications

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“…The only previously published measurements on alkaline earth silicate systems are by Asano and Kou. (19) They studied the strontium silicate system, and found the species SrSiO in the gas phase in the temperature range 1337 K to 1602 K. We were, however, unable to detect the analogous species in the corresponding barium system.…”

Section: Discussionmentioning

confidence: 93%

A thermodynamic study of gaseous BaSiO3

Cordfunke

Groen

Huntelaar

et al. 2000

The Journal of Chemical Thermodynamics

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Section: Discussionmentioning

confidence: 93%

A thermodynamic study of gaseous BaSiO3

Cordfunke

Groen

Huntelaar

et al. 2000

The Journal of Chemical Thermodynamics

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“…For example, the calculated vapor pressure of B 2 O 3 ( g ) was about 4.9 × 10 −6 Pa (log p O 2 =−5.31 log Pa) at 800°C in air, assuming that B 2 O 3 ( l ) had an activity of one. The reported partial pressure of B 2 O 3 ( g ) over a SrO–1.01B 2 O 3 –1.01SiO 2 ‐melt, in the temperature range from 1337 to 1496 K, can be expressed by 15 …”

Section: Discussionmentioning

confidence: 99%

Borate Volatility from SOFC Sealing Glasses

Zhang

Fahrenholtz

Reis

et al. 2008

Journal of the American Ceramic Society

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The volatility of borate species from glasses developed for solid oxide fuel cell seals was studied using thermodynamic calculations and compared with experimental results. Vapor pressure diagrams were used to identify the most volatile compounds under a range of expected operational conditions, e.g. oxidizing and reducing atmospheres with water vapor, at temperatures in the range of 7001-10001C. The species with the highest vapor pressures were BO 2 (g) under dry conditions and B 3 H 3 O 6 (g) under wet, reducing conditions. The depletion of boron from glass surfaces to depths beyond 100 nm was characterized using Auger electron spectroscopy depth profile analysis. Weight loss experiments were conducted on several different glass compositions. The cumulative weight loss from a glass with 20 mol% B 2 O 3 (''glass #59'') was about 10 times greater than from a glass with 2 mol% B 2 O 3 (''glass #27''), under the same conditions. The activation energy for volatilization from glass #59 was 371786 kJ/mol and was 272765 kJ/mol for ''glass #27.'' The cumulative weight loss of each composition in forming gas with 30% water vapor was greater than in dry air at 8001C. Volatile species were collected in a water trap, and these results confirmed predictions about the effect of atmosphere and B 2 O 3 content on volatilization behavior.

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“…At present, a considerable number of works [53][54][55][56][57][58][59][60][61][62][63] (predominantly performed using high-temperature mass spectrometry) have been devoted to investigation of the vaporization in MO-B 2 O 3 systems (where M is an alkaline-earth ions are equal to 8.4 and 12.0 eV, respectively. Furthermore, the ionization efficiency curve for MgB ions exhibited a kink, which was assigned to dissociative ionization of MgB 2 ions.…”

Section: Alkaline-earth Metaboratesmentioning

confidence: 99%

“…The calculated standard enthalpies of formation of gaseous BaBO 2 and BaB 2 O 4 at 0 K are equal to -675.3 ± 29.3 and -1344 ± 44.8 kJ/mol, respectively. In a series of works [56][57][58][59][60], the authors studied the vaporization processes in the SrO-B 2 MBO 2 were calculated from the equilibrium constants experimentally obtained in the range 1390-1535 K. These enthalpies are equal to -636 ± 19 kJ/mol for SrBO 2 and -633 ± 21 kJ/mol for BaBO 2 . Moreover, the enthalpy of formation of gaseous CaBO 2 was estimated at -526 ± 46 kJ/mol in [58].…”

Section: Alkaline-earth Metaboratesmentioning

confidence: 99%

Thermodynamic properties and structure of gaseous metaborates

Лопатин

Stolyarova

2006

Glass Phys Chem

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A review is presented of the data available in the literature on the thermodynamic properties and structure of gaseous metaborates studied by high-temperature mass spectrometry, gas-phase electron diffraction, spectroscopy, and quantum-chemical methods. The reliability and inconsistency of the thermodynamic properties and structural data obtained by these methods for gaseous metaborates are discussed. The specific features of the application of the above methods for investigating the thermodynamic properties and structure of gaseous metaborates at high temperatures are analyzed.

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Thermochemical properties of SrSiO(g) and SrBO2(g)

Cited by 14 publications

References 9 publications

A thermodynamic study of gaseous BaSiO3

A thermodynamic study of gaseous BaSiO3

Borate Volatility from SOFC Sealing Glasses

Thermodynamic properties and structure of gaseous metaborates

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