Thermochemical properties of BaBO2(g) and Ba3B2O6(s)

Asano, Masaharu; Kou, Tomoyuki

doi:10.1016/0021-9614(89)90031-1

Cited by 16 publications

(2 citation statements)

References 13 publications

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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%

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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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Section: Alkaline-earth Metaboratesmentioning

confidence: 99%

Section: Alkaline-earth Metaboratesmentioning

confidence: 99%

Thermodynamic properties and structure of gaseous metaborates

Лопатин

Stolyarova

2006

Glass Phys Chem

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High temperature mass spectrometric study of oxide systems and materials

Stolyarova

1993

Rapid Comm Mass Spectrometry

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High temperature mass spectrometry is a powerful tool for studying the vaporization processes and thermodynamic properties of different types of materials such as glasses, ceramics and coatings. This paper illustrates the main advantages of this method for investigations of oxide systems and the approaches available to predict the relative volatilities as well as the thermodynamic properties of materials based on these systems.The search for appropriate ways of obtaining new materials with required properties is closely associated with the progress made in the fields of energetics, metallurgy, and instrument and rocket making, as well as with the solution of problems of environmental protection. Most promising at present are oxide materials, which are characterized by superstrength, refractoriness and thermal stability. At high temperatures, however, the conditions of synthesis, study and use of materials are greatly complicated because of selective vaporization of components, leading to limited thermal stability. During the lase decade, as a result of further improvement of high temperature technologies, physico-chemical databanks have become widespread. Along with other properties, these databanks contain both thermodynamic functions of oxide systems and those of models which enable the thermodynamic properties of multicomponent oxide systems to be calculated. The results of experimental studies remain, as before, the only criterion of the validity and reliability of such calculations. Together with the electromotive force method and high-temperature calorimetric techniques, one of the most informative methods of high temperature chemistry is Knudsen effusion mass spectrometry. Within the framework of this method, it is possible not only to determine thermodynamic properties of components in condensed as well as gaseous phases, but also to determine vapour composition.The subject of the present Communication is oxide systems, which are the basis of glasses, glass-forming materials and slag melts, film materials, coatings and oxide ceramics. They include:(i) binary systems such as (NazO, CaO, B203, GeOz)-SiOz, Na20-B203, Na,O-GeO,, GeOz-P,05 and BaO-B203; (ii) ternary systems such as Na20-Bz03-Ge0,, B203-Ge02-Si0, and Ca0-A1203-Si02; (iii) multicomponent borosilicate glasses; (iv) coatings based on the B203-Si02 system with addi-(v) concrete; (vi) phosphate binder.The initiation of these studies was a very urgent requirement for meeting the needs of modern technologies in providing reliable information on vaporization processes and thermodynamic properties of oxide mat- erials. It is also necessary to find new semiempirical and statistical thermodynamic approaches in order to calculate the equilibria between condensed phase and vapour in oxide melts.The present work summarizes the available experimental data on vapour composition and thermodynamic properties of melts based on silica, boron, germanium and phosphorus oxides obtained by the author and her colleagues in the Institute of Silicate Chemistry of the Rus...

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The System Boron—Oxygen

Heller

1993

B Boron Compounds

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Thermochemical properties of BaBO2(g) and Ba3B2O6(s)

Cited by 16 publications

References 13 publications

Thermodynamic properties and structure of gaseous metaborates

Thermodynamic properties and structure of gaseous metaborates

High temperature mass spectrometric study of oxide systems and materials

The System Boron—Oxygen

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