Hostname: page-component-78c5997874-mlc7c Total loading time: 0 Render date: 2024-11-20T01:00:54.918Z Has data issue: false hasContentIssue false
  • English
  • Français

Phase Separation in Reduced LiNbO3

Published online by Cambridge University Press:  28 February 2011

H.M. Chan ,
Z. Zhuang  and
D. M. Smyth
H.M. Chan
Affiliation:
Materials Research Center, No. 32, Lehigh University, Bethlehem, PA 18015
Z. Zhuang
Affiliation:
South China Institute of Technology, Guangzhou, China
D. M. Smyth
Affiliation:
Materials Research Center, No. 32, Lehigh University, Bethlehem, PA 18015
Get access

Abstract

LiNbO3 tolerates large amounts of disorder in the form of Li2O- deficiency, oxygen-deficiency, and substitutional impurities. These should all result in the formation of a self-consistent set of lattice defects, and there will thus be interactions between the different types of disorder. It is shown that reduction will result in an increase of the Li2O activity in LiNbO3 when it is kinetically hindered from exchanging Li2O with its surroundings. This is in fact the situation for exposure to reducing atmospheres for several hours near 1000°C. Available data on compositions and defect concentrations at 1050°C indicate that reduction should result in separation of a Li20-rich second phase for oxygen partial pressures below 10−17 about 10 atm. Evidence for such phase separation is described.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 60: Symposium L – Defect Properties and Processing of High-Technology Nonmetallic Materials , 1985 , 95
Copyright
Copyright © Materials Research Society 1986

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Rauber, A., in Current Topics in Materials Science, Vol. I, edited by Kaldis, E. (North Holland, Amsterdam, 1978), p. 481.Google Scholar
2. Lerner, P., Legras, C., and Duman, J. P., J. Cryst. Growth 3/4, 231 (1968).Google Scholar
3. Smyth, D. M., Ferroelectrics 50, 93 (1983).CrossRefGoogle Scholar
4. Holman, R. L., in Proc. of 14th University Conf. in Ceramic Science, edited by Palmour, H., Davis, R. F., and Hare, T. M. (Plenum Press, New York, 1979).Google Scholar
5. Holmes, R. J. and Smyth, D. M., J. Appl. Phys. 55, 3531 (1984).Google Scholar
6. Kroger, F. A. and Vink, H. J., in Solid State Physics, Vol. 3, edited by Seitz, F. and Turnbull, D. (Academic Press, New York, 1956), p. 307.Google Scholar
7. Abrahams, S. C. and Marsh, P., Acta Cryst. B42, 61 (1986).Google Scholar
8. Limb, Y., Cheng, K. W., and Smyth, D. M., Ferroelectrics 38, 813 (1981).CrossRefGoogle Scholar
9. Bergmann, G., Solid State Commun. 6, 77 (1968).Google Scholar
10. Jorgensen, P. J. and Bartlett, R. W., J. Phys. Chem. Solids 30, 2639 (1969).Google Scholar
11. Nagels, P., in The Hall Effect and Its Applications, edited by Chien, C. L. and Westlake, C. R. (Plenum Press, New York, 1980), p. 253.Google Scholar
12. Smyth, D. M., SPIE Vol. 460 - Processing of Guided Wave Optoelectronic Materials, 22 (1984).Google Scholar
13. Holmes, R. J., Kim, Y. S., Brandle, C. D., and Smyth, D. M., Ferroelectrics 51, 41 (1983).CrossRefGoogle Scholar