Hostname: page-component-cd9895bd7-hc48f Total loading time: 0 Render date: 2024-12-28T01:32:08.970Z Has data issue: false hasContentIssue false
  • English
  • Français

Grain growth in donor-doped SrTiO3

Published online by Cambridge University Press:  31 January 2011

C-J. Peng  and
Y-M. Chiang
C-J. Peng
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
Y-M. Chiang
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
Get access

Abstract

The Nb donor concentration and cation stoichiometry dependence of grain growth in SrTiO3 has been studied. The so-called donor anomaly, where grain growth is enhanced at low donor but suppressed at high donor concentrations, is observed only in nonstoichiometric compositions with an excess of B-site cations. Scanning transmission electron microscopy (STEM) observations indicate that this phenomenon is entirely a result of changes in the distribution of residual silicate phases. Exaggerated grain growth at low donor concentrations results from the presence of a continuously wetting grain boundary silicate, whereas inhibited growth at higher donor concentrations occurs in microstructures where the silicate phase is nonwetting. In stoichiometric compositions, however, grain growth rates are both slower and independent of donor concentration. In this composition regime grain growth appears to be limited by solid solution drag. The presence of residual silicates only in nonstoichiometric compositions implies a strong stoichiometry dependence of the silica solubility.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 6 , June 1990 , pp. 1237 - 1245
Copyright
Copyright © Materials Research Society 1990

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

REFERENCES

1Kahn, M., Am, J.. Ceram. Soc. 54 (9), 452–454 (1971).CrossRefGoogle Scholar
2Wernicke, R., Phys. Status Solidi (A) 47, 139–144 (1978).CrossRefGoogle Scholar
3Yan, M. F., Mater. Sci. Eng. 48, 53–72 (1981).CrossRefGoogle Scholar
4Burn, I. and Neirman, S., J. Mater. Sci. 17, 3510–3524 (1982).CrossRefGoogle Scholar
5Xue, L.A., Chen, Y., and Brook, R. J., J. Mater. Sci. 7, 1163–1165 (1988).Google Scholar
6Witek, S., Smyth, D.M., and Pickup, H., J. Am. Ceram. Soc, 67 (5), 372–375 (1984).CrossRefGoogle Scholar
7Eror, N. G. and Balachandran, U., J. Solid State Chem. 42, 227–241 (1982).CrossRefGoogle Scholar
8Balachandran, U. and Eror, N. G., J. Mater. Sci. 17, 2133–2140 (1982).CrossRefGoogle Scholar
9Hu, Y.H., Harmer, M.P., and Smyth, D.M., J. Am. Ceram. Soc, 68, 372–376 (1985)CrossRefGoogle Scholar
10Sharma, R. K., Chan, N-H., and Smyth, D. M., J. Am. Ceram. Soc. 64 (8) 446–451 (1981).CrossRefGoogle Scholar
11Fujimoto, M. and Kingery, W. D., J. Am. Ceram. Soc. 68 (4), 169–173 (1985).CrossRefGoogle Scholar
12Hennings, D. F. K., Janssen, R., and Reynen, P. J. L., J. Am. Ceram. Soc. 70 (1), 23–27 (1987).CrossRefGoogle Scholar
13Pechini, M. P., “Method of Preparing Lead and Alkaline Earth Titanates and Niobates and Coatings Using the Same to Form a Capacitor,” U.S. Pat. 3,330,697, July 11, 1967.Google Scholar
14Underwood, E. E., Quantitative Stereology (Addison-Wesley, Reading, MA, 1970).Google Scholar
15Yan, M. F., Cannon, R. M., and Bowen, H. K., in Ceramic Microstructures 1976, edited by Fulrath, R. M. and Pask, J. A. (Westview Press, Boulder, CO, 1977), pp. 276–307.Google Scholar
16Chiang, Y-M. and Peng, C-J., in Advances in Ceramics, Vol. 23: Nonstoichiometric Compounds (The American Ceramic Society, Westerville, OH, 1987), pp. 361–377.Google Scholar
17Chan, N-H., Sharma, R. K., and Smyth, D. M., J. Electrochem. Soc. 128 (8), 1762–1769 (1981).CrossRefGoogle Scholar
18Balachandran, U. and Eror, N. G., J. Electrochem. Soc. 129 (5), 1021–1026 (1982).CrossRefGoogle Scholar
19Jonker, G.H., Solid-State Electron. 7, 895–903 (1964).CrossRefGoogle Scholar
20Eror, N. G. and Smyth, D. M., in The Chemistry of Extended Defects in Non-Metallic Solids edited by Eyring, L. and O'Keefe, M. (North-Holland, Amsterdam, 1970), pp. 62–74.Google Scholar
21Daniels, J. and Hardtl, K. H., Philips Res. Rep. 31, 487–559 (1976).Google Scholar
22Udayakumar, K. R. and Cormack, A. N., “Nonstoichiometry in Alkaline Earth Excess Alkaline Earth Titanates,” to appear in J. Phys. Chem. Solids.Google Scholar
23Dynna, G. M. and Chiang, Y-M., “Mechanisms of Grain Growth Enhancement and Inhibition in Donor-Doped Barium Titanate,” to appear in Sintering of Advanced Ceramics (The American Ceramic Society, Westerville, OH, 1989).Google Scholar
24 Samples provided by Fujimoto, M. of Taiyo Yuden Co., Ltd., Central Research Laboratory, Gunma, Japan.Google Scholar
25Phase Diagrams for Ceramists (The American Ceramic Society, Westerville, OH).Google Scholar
26Gambino, J. P., “The Influence of Microstructure, Grain Boundary Segregation and Grain Boundary Stoichiometry on the Electrical Properties of ZnO Varistors,” Ph. D. Thesis, Massachusetts Institute of Technology, 1984.Google Scholar
27Heyrich, H. and Knauer, U., Ferroelectrics 31, 151–156 (1981).CrossRefGoogle Scholar
28Schmelz, H. and Meyer, A., Ceram. Forum Int. 59, 436–440 (1982).Google Scholar