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Antiphase Domains in Long-Period Superlattices

  • P. Chaudhari (a1) and A. Gangulee (a2)

Abstract

The antiphase boundary in a superlattice has been defined as the boundary between two neighboring zones which are out ofsphase with each other. This difference in phase is usually represented by a translation vector. In long-period superlattices, however, antiphase boundaries of the above mentioned type occur with regular spacings, thereby introducing another element of order which shows up as satellite peaks in the diffraction pattern. A second kind of antiphase boundaries may be defined in a one-dimensional long-period superlattice as the boundary between two neighboring zones which have different directions of repetition of the antiphase boundaries of the first kind. A theory of X-ray diffraction to obtain the size of the domains of the second kind in a one-dimensional long-period superlattice has been developed. An application of this theory to the ordered alloy Ag3Mg, known to have a one-dimensional long-period superlattice, is described and the results of the X-ray measurements are compared with those obtained by transmission electron microscopy.

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References

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1. Gangulee, A. and Moss, S. C., “Long Range Order in Ag3Mg”, to be published in Jl. Appl. Cryst., 1, 1968.
2. Glossop, A. B. and Pashley, D. W., “The Direct Observation of Antiphase Domain Boundaries in Ordered Copper-Gold (CuAu) Alloy”, Proc. Roy. Soc. (London), A250: 132146, 1959.
3. Wilson, A. J. C., “The reflexion of X-rays from the ‘anti-phase nuclei’ of AuCu3”, Proc. Roy. Soc. (London), A181: 360368, 1943.
4. Gangulee, A. and Bever, M. B., “The Silver-rich Solid Solutions in the System Silver-Magnesium:I Short-Range Order”, Trans. Met. Soc. AIME, 242:272277, 1968.
5. Taylor, A., “X-ray Metallography”, pp. 685694, John Wiley and Sons, New York, 1961.
6. Jones, F. W., “The Measurement of Particle Size by X-ray Methods”, Proc. Roy. Soc. (London), A166:1643, 1938.

Antiphase Domains in Long-Period Superlattices

  • P. Chaudhari (a1) and A. Gangulee (a2)

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