Abstract
The diffusion of radiotracer sulfur in single crystals and in pressed powder compacts of NiO has been studied. The diffusivities for the undoped single crystals were:D = 1.89 × 10-5 exp(-185.3 kJ/RT), cm2/s between 820°C and 1200°C and under virtually constant [0.77 to 1.0 atm] oxygen pressure. The diffusivities in pressed powders were greater than in the corresponding single crystalline specimens. The diffusivity of sulfur in NiO increased as the oxygen partial pressure over the crystal decreased. This result indicates that sulfur might migrate via oxygen vacancies. The diffusivity of sulfur in Cr-doped crystals was found to be about an order of magnitude lower than the undoped crystal. The results obtained on the doped crystals were consistent with the oxygen vacancy mechanism.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
M. J. Donachie Jr., R. A. Sprague, R. N. Russell, K. G. Boll, and E. P. Bradley:ASTM STP, 1967, vol. 421, pp. 85–104.
P. R. Belcher, R. J. Bird, and R. W. Wilson:ASTM STP, 1967, vol. 421, pp. 123–45.
D. R. Chang, W. Stewart, and J. B. Wagner, Jr.:Proc. Seventh Int’l Symposium on the Reactivity of Solids, p. 231, Chapman and Hall, Ltd., Bristol, England, July 1972.
J. B. Price and J. B. Wagner, Jr.:Z. Physik Chem. (N.F.), 1966, vol. 49, pp. 257–70.
D. R. Chang: Ph.D. Thesis, Northwestern University, 1973.
J. S. Choi and W. J. Moore:J. Phys. Chem., 1962, vol. 66, pp. 1308–11.
M. O’Keefe and W. J. Moore:J. Phys. Chem., 1961, vol. 65, pp. 1438–39.
J. B. Price and J. B. Wagner, Jr.:J. Electrochem. Soc., 1970, vol. 117, pp. 242–47.
N. G. Eror and J. B. Wagner, Jr.:Phys. Status Solidi, 1969, vol. 35, pp. 641–51.
K. Hauffe:Ann Phys., 1950, vol. 8, pp. 201–10.
G. M. Schwab and H. Schurid:J. Appl. Phys., 1962, vol. 33, pp. 426–28.
I. F. Kononyuk and M. M. Pavlyuchenko:Geterogennye Khim. Reakt., 1961, p. 231; known throughChem. Abstr., 1962, vol. 57, p. 3162h.
R. J. Brigham, H. Neumayer, and J. S. Kirkaldy:Can. Met. Quart., 1970, vol. 9, pp. 525–29.
Author information
Authors and Affiliations
Additional information
D. R. Chang and R. Nemoto were formerly Graduate Student and Visiting Scholar, respectively, in the Department of Materials Science and Engineering at Northwestern University.
Rights and permissions
About this article
Cite this article
Chang, D.R., Nemoto, R. & Wagner, J.B. The diffusion of sulfur-35 in NiO. Metall Trans A 7, 803–806 (1976). https://doi.org/10.1007/BF02644076
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02644076