Abstract
The activity/concentration relationships of NiO in R2O-B2O3 melts (R = Li, Na or K) have been studied by saturating glass melts contained in a nickel crucible under different partial pressures of oxygen. A pure boric oxide melt dissolves very little NiO (solubility less than 0.001 wt %); on adding R2O the solubility increases and reaches a maximum around 20 mol % for Li2O and Na2O, and 30 mol % for K2O; thereafter the solubility of NiO decreases with increasing R2O content of the melt, the maximum decrease being in K2O-B2O3 melts. It is suggested that the low solubility of NiO in low- and high-alkali borate melts is due to poor donor capacity of BΦ 3/2 groups and high activity of oxide ions respectively. NiO in alkali borate melts produces a non-ideal solution.
Similar content being viewed by others
References
A. Paul and R. W. Douglas, Phys. Chem. Glasses, 10 (1969) 133; R. W. Douglas and M. S. Zaman, ibid 10 (1969) 125.
J. A. Pask and R. M. Fulrath, J. Amer. Ceram. Soc. 45 (1962) 592; M. P. Broom and J. A. Pask, ibid 49 (1966) 1.
M. Humenick, Jun., and W. D. Kingery, ——ibid 37 (1954) 18.
S. Banerjee, Ph.D. Thesis, University of Sheffield (1969); A. M. Lacy, Ph.D. Thesis, University of California, Berkeley (1969); H. Ray, Trans. Ind. Ceram. Soc. 28 (1969) 82.
A. Paul and R. W. Douglas, Phys. Chem. Glasses 8 (1967) 233.
P. J. Bray and J. G. O'Keefe, ——ibid 4 (1963) 37.
A. Paul and R. W. Douglas, ——ibid 8 (1967) 151.
A. Paul and S. Basu, Trans. J. Brit. Ceram. Soc. 73 (4) (1974) 167.
E. C. Freiling, “Thermodynamics”, Vol. 4 (International Atomic Energy Agency, Vienna, 1966) p. 435.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Paul, A. Activity of nickel oxide in alkali borate melts. J Mater Sci 10, 422–426 (1975). https://doi.org/10.1007/BF00543686
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00543686