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Science 22 August 1986:
Vol. 233. no. 4766, pp. 875 - 876
DOI: 10.1126/science.233.4766.875
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Articles

Observations of Pentagonally Twinned Precipitate Needles of Germanium in Aluminum

U. DAHMEN 1 and K. H. WESTMACOTT 1

1 National Center for Electron Microscopy, Materials and Molecular Research Division, Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720.

Unusual pentagonally twinned precipitates were observed in a high-resolution transmission electron microscopy study of needle-shaped germanium particles in aluminum. Although commonly found in small particles formed on substrates, such twinning has not been seen in precipitates grown in the solid state. The morphologies and orientation relationships are consistent with symmetry principles.

Submitted on April 4, 1986
Accepted on May 30, 1986

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Science. ISSN 0036-8075 (print), 1095-9203 (online)