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Science 6 November 1987:
Vol. 238. no. 4828, pp. 780 - 783
DOI: 10.1126/science.238.4828.780
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Articles

Mechanism of the Body-Centered Cubic—Hexagonal Close-Packed Phase Transition in Iron

W. A. BASSETT 1 and E. HUANG 1

1 Department of Geological Sciences, Cornell University, Ithaca, NY 14853.

The transition from body-centered cubic to hexagonal close-packed phase in iron has been studied in a diamond anvil cell with synchrotron radiation. The hexagonal close-packed phase, when it first appears, has a ratio of lattice parameters that is significantly larger than normal. This is attributed to a displacive mechanism that causes a distortion of the hexagonal close-packed structure in a body-centered cubic matrix. The hexagonal close-packed phase adjacent to a boundary with the body-centered cubic phase is stretched in the c direction and compressed in the a direction when it first forms.

Submitted on July 6, 1987
Accepted on September 8, 1987

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