Advertisement

Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Vaporization of glasses in the R2O-Cs2O-B2O3-SiO2 (R = Li, Na, K and Rb) system

Abstract

A mass-spectrometric Knudsen effusion method has been used for thermochemical study of the vaporization of alkali borosilicate glasses in the R2O-Cs2O-B2O3-SiO2 system, where R = Li, Na, K and Rb. Vapours of RBO2(g), CsBO2(g), R2(BO2)2(g) and RCs(BO2)2(g) have been identified. Over the glasses in which the molar ratio of (R2O + Cs2O)/B2O3 is slightly larger than unity, vapours of R(g), except for Li(g), have been further observed in the initial stage of heating; over the glass containing lithium, however, the vaporization of Cs(g) has been found. Neither R(g) nor Cs(g) has been identified over the glasses in which the molar ratio is equal to unity. Partial pressures of CsBO2(g) over the glasses containing lithium and sodium are lower than those with potassium and rubidium, indicating that chemical activities of the CsBO2 pseudo-component in the glasses with lithium and sodium are small. Enthalpies of formation as well as dissociation energies for dimeric vapours of alkali metaborates are not very different from one another, except that the dissociation energies for the dimeric vapours containing lithium are larger than for those containing the other elements.

This is a preview of subscription content, log in to check access.

References

  1. 1.

    J. W. Hastie, E. R. Plante andD. W. Bonnel, Report NBSIR-83-2731 (National Institute of Standards and Technology, Washington, DC, 1983).

  2. 2.

    H. Yamanaka, R. Terai andS. Hara,Osaka Kogyo Gijutsu Shikenjo Kiho (Bull. Govt. Inst., Osaka)34 (1983) 228.

  3. 3.

    M. Asano, T. Harada andY. Mizutani,High Temp. Sci. to be published.

  4. 4.

    M. Asano, T. Kou andY. Yasue,J. Non-Cryst. Solids 92 (1987) 245.

  5. 5.

    M. Asano, T. Kou andY. Mizutani,ibid. 112 (1989) 381.

  6. 6.

    M. Asano andY. Yasue,J. Nucl. Mater. 138 (1986) 65.

  7. 7.

    M. Asano andT. Kou,Phys. Chem. Glasses 30 (1989) 39.

  8. 8.

    M. Asano, Y. Yasue andK. Kubo,Bull. Inst. Atom. Energy, Kyoto Univ. 66 (1984) 39.

  9. 9.

    M. Asano, Y. Yasue andK. Kubo,J. Nucl. Sci. Technol. 21 (1984) 614.

  10. 10.

    D. E. Gray, “American Institute of Physics Handbook”, 3rd Edn (McGraw-Hill, New York, 1972) p. 7–6.

  11. 11.

    J. B. Mann, in “Recent Developments in Mass Spectroscopy”, edited by K. Ogata and T. Hayakawa (University of Tokyo press, Tokyo, 1970) p. 814.

  12. 12.

    J. Kordis andK. A. Gingerich,J. Chem. Phys. 58 (1973) 5141.

  13. 13.

    M. Asano, H. Kimura andK. Kubo,Mass Spectros. 27 (1979) 157.

  14. 14.

    M. Asano.T. Kou, Y. Yasue andH. Nakagawa,Bull. Inst. Atom. Energy, Kyoto Univ. 73 (1988) 51.

  15. 15.

    R. D. Stull andH. Prophet, “JANAF Thermochemical Tables”, 2nd Edn (US Printing Office, Washington, DC, 1971), Supplements 1974, 1975, 1978, 1982 and 1985.

  16. 16.

    Y. Yasue, M. Asano andK. Kubo,Bull. Inst. Atom. Energy, Kyoto Univ. 65 (1984) 49.

  17. 17.

    A. V. Gusarov, A. V. Makarov andO. T. Nikitin,Zh. Fiz. Khim. 51 (1977) 525.

  18. 18.

    Y. Yasue andM. Asano,Bull. Inst. Atom. Energy, Kyoto Univ. 67 (1985) 48.

  19. 19.

    T. Furukawa andW. B. White,J. Mater. Sci. 16 (1981) 2689.

  20. 20.

    Y. H. Yun andP. T. Bray,J. Non-Cryst. Solids 27 (1978) 363.

  21. 21.

    J. T. Wenzel andD. M. Sanders,Phys. Chem. Glasses 23 (1982) 47.

  22. 22.

    F. D. Richardson, “Physical Chemistry of Melts in Metallurgy”, Vol. 1 (Academic, London, 1974) p. 202.

  23. 23.

    S. Ban-Ya andM. Hino,Tetsu-to-Hagane (J. Iron and Steel Inst. Jpn)73 (1987) 476.

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Asano, M., Harada, T. & Mizutani, Y. Vaporization of glasses in the R2O-Cs2O-B2O3-SiO2 (R = Li, Na, K and Rb) system. J Mater Sci 26, 399–406 (1991). https://doi.org/10.1007/BF00576533

Download citation

Keywords

  • Sodium
  • Polymer
  • Potassium
  • Enthalpy
  • Lithium