Mass spectrometric study of the vaporization of sodium borosilicate glasses

Asano, Masaharu; Yasue, Yoshihiko

doi:10.1016/0022-3115(86)90256-4

Cited by 24 publications

(17 citation statements)

References 9 publications

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“…11 B MAS NMR measurements of the medium-range order reedmergnerite and danburite structures present in all compositions, confirm that volatility is more pronounced in aluminium oxide-and lanthanum oxide-containing glasses, where there is an increasing presence of danburite units, containing energetically less favorable B 4 -B 4 bonds and this is confirmed by volatilization measurements on caesium-containing danburite and reedmergnerite glasses. The composition of the volatile species was found to be of a mixed-alkali borosilicate form, whereas previous results in similar studies have found it to be alkali borate [7][8][9][10].…”

Section: Discussioncontrasting

confidence: 68%

“…8) show the volatile species to contain caesium, sodium, boron, silicon and probably lithium, suggesting the composition to be mixed-alkali borosilicate in form. The studies carried out by Asano et al [7,9,10] and Bonnell et al [8] on vaporization from caesium-containing borosilicate glasses, found the composition of the vapour to be alkali borate in form, devoid of any silicon.…”

Section: Nmr and Volatilization Measurementsmentioning

confidence: 97%

“…A significant problem associated with the process of HLW vitrification is the evolution of a volatile species at the glass melt stage. Although the volatile species is known to be caesium-containing [6][7][8][9][10], its overall composition and the structural conditions affecting its formation have still to be fully established. We have sought to identify those structural changes which occur in the solid glass when caesium oxide is added to a variety of simulated waste-forms and attempt to relate these to the measured volatilization losses from the melt.…”

Section: Introductionmentioning

confidence: 99%

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Effect of minor additions on structure and volatilization loss in simulated nuclear borosilicate glasses

Parkinson

Holland

Smith

et al. 2007

Journal of Non-Crystalline Solids

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Section: Discussioncontrasting

confidence: 68%

Section: Nmr and Volatilization Measurementsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of minor additions on structure and volatilization loss in simulated nuclear borosilicate glasses

Parkinson

Holland

Smith

et al. 2007

Journal of Non-Crystalline Solids

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“…The polymerization reactions (6)-(8) of gaseous alkali metaborates were investigated in [19,23,[34][35][36][37][38][39], and the mixed dimerizarion reaction (9) of gaseous alkali metaborates was studied in [34][35][36][37][38].…”

Section: Alkali Metaboratesmentioning

confidence: 99%

“…It should be noted that the enthalpies of polymerization in the vapors over glasses of different compositions differ from each other. In [34][35][36][37][38][39], the standard enthalpies of formation of gaseous polymers were calculated from Eqs. (3) and (4) under the assumption that the enthalpy and entropy of reactions do not depend on the temperature.…”

Section: Alkali 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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Relative volatility of borosilicate glasses: a mass spectrometric study

Archakov

Stolyarova

Shultz

1998

Rapid Commun. Mass Spectrom.

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A high temperature Knudsen effusion method was used to study the composition of vapour and partial vapour pressures of species in multicomponent borosilicate glasses. Data on the activities of metaborates of alkali metals were obtained. Using an acid-base concept the relative volatility of these glasses was compared and discussed. # 1998 John Wiley & Sons, Ltd. Received 25 March 1998; Revised 1 July 1998; Accepted 2 July 1998 Borosilicate glasses have a wide range of applications in various modern technologies and therefore there is significant interest to study their physico-chemical properties.Vaporization processes play an important role during the preparation, study and applications of multicomponent glasses based on boron oxide and silica at temperatures higher than 1400 K. Information on the composition of vapour and partial vapour pressures as a function of temperature is required when borosilicate glasses are used for the incorporation of nuclear wastes, 1,2 for the production of low volatile glasses, 3 during application of glass solders, 4 during production of ion-selective transistors 5 and details of electronic equipment. 6Recently a series of papers have been published on the vaporization processes of multicomponent borosilicate glasses studied by high temperature mass spectrometry. These have obtained information on the composition of vapour and thermodynamic properties of components in multicomponent systems. In Ref. 7, concerning the vapour over glasses of the Na 2 O-B 2 O 3 -SiO 2 system, the vaporization of sodium metaborate and products of dissociation of sodium oxide were identified. Data on the partial pressures of components as a function of temperature were obtained by the authors 7 in the temperature range 915-1172 K. Later caesium and rubidium borosilicate glasses 8,9 as well as the Na 2 O-B 2 O 3 -SiO 2 -TeO 2 10 system were studied. It should be mentioned that the work in Refs 7-10 was carried out in connection with the disposal and treatment of radioactive wastes. The main trends of the vaporization processes of these glasses has been discussed. For a mixture of alkali oxides compared with B 2 O 3 at similar relative abundances, there are two main vaporization processes, such as vaporization of the individual alkali oxide and alkali metaborate. When the concentration of B 2 O 3 is higher than the alkali oxide mainly alkali metaborate is observed on vaporization. The same vaporization tendency was illustrated earlier in the case of the Na 2 O-B 2 O 3 -GeO 2 system. 11 The following order of the relative volatilities of alkali metaborates was suggested by Asano et al. 9 at constant temperature and constant ratio of oxides in a multicomponent system : p In the present study the results of vaporization of glasses NK1 and NKS are most important for the electronic industry, and for the incorporation of nuclear wastes T2 and T(Cs) the results are considered.

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Mass spectrometric study of the vaporization of sodium borosilicate glasses

Cited by 24 publications

References 9 publications

Effect of minor additions on structure and volatilization loss in simulated nuclear borosilicate glasses

Effect of minor additions on structure and volatilization loss in simulated nuclear borosilicate glasses

Thermodynamic properties and structure of gaseous metaborates

Relative volatility of borosilicate glasses: a mass spectrometric study

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