Hostname: page-component-7bb8b95d7b-pwrkn Total loading time: 0 Render date: 2024-09-13T05:30:29.184Z Has data issue: false hasContentIssue false
  • English
  • Français

Structure of Oxides Grown on Zr-20Nb Alloy

Published online by Cambridge University Press:  15 February 2011

O.T. Woo ,
D.J. Lockwood ,
Y.P. Lin  and
V.F. Urbanic
O.T. Woo
Affiliation:
AECL Research, Chalk River Laboratories, Chalk River, Ontario K0J 1J0, CANADA
D.J. Lockwood
Affiliation:
National Research Council of Canada, Institute for Microstructural Sciences, Montreal Road, Ottawa, Ontario K1A 0R6, CANADA
Y.P. Lin
Affiliation:
Ontario Hydro Technologies, 800 Kipling Avenue, Toronto, Ontario M8Z 5S4, CANADA
V.F. Urbanic
Affiliation:
AECL Research, Chalk River Laboratories, Chalk River, Ontario K0J 1J0, CANADA
Get access

Abstract

Oxides grown on Zr-20Nb were characterized by Raman Spectroscopy (RS), X-Ray Diffraction (XRD) and Transmission Electron Microscopy (TEM). These oxides were steamformed at 400°C, water-formed at 360 °C and at 300 °C, and air-grown at 400°C. For the oxides grown after relatively short exposures at 360°C and at 400°C, Raman spectra revealed broad peaks at 260 and 660 cm− indicating a crystal structure with high symmetry. Comparison with reference Raman spectra of cubic (c), tetragonal (t), and monoclinic (m) ZrO2 suggested that the oxide was predominantly nearly-cubic (tetragonal with c/a ratio ≈ 1), with minor amounts of moxide. The tetragonality is found to be consistent with TEM analyses and XRD results which showed the presence of a doublet near 2θ ° 74°. The crystal structure in the short-term exposed oxides is interpreted in terms of a tetragonal distortion arising from the displacement of oxygen atoms within the cubic ZrO2 crystal structure. For oxides grown after longer periods of exposure at 300°C and at 400°C, RS and XRD indicate increased amounts of m-oxide.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 357: Symposium C – Structure and Properties of Interfaces in Ceramics , 1994 , 219
Copyright
Copyright © Materials Research Society 1995

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. Urbanic, V.F., Chan, P.K., Khatamian, D. and Woo, O.T., in Zr in the Nuclear Industry: 10th International Conference, Baltimore 1993, American Soc. for Testing and Materials, in press.Google Scholar
2. Lin, Y.P., Woo, O.T. and Lockwood, D.J., Mater. Res. Soc. Proc. 343, 487 (1994).Google Scholar
3. Sugiyama, M. and Kubo, H., Advances in Ceramics, 24B, 965 (1988).Google Scholar