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Science 10 August 1990:
Vol. 249. no. 4969, pp. 647 - 649
DOI: 10.1126/science.249.4969.647
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Articles

Memory Glass: An Amorphous Material Formed from AlPO4

M. B. Kruger 1 and Raymond Jeanloz 2

1 Departrnent of Physics, University of California, Berkeley, CA 94720
2 Department of Geology and Geophysics, University of California, Berkeley, CA 94720

A glass exhibiting structural memory has been produced through the compression of a single crystal of AlPO4 berlinite to 18 gigapascals at 300 kelvin. The unique and extraordinary characteristic of this glass is that upon decompression below 5 gigapascals it transforms back into a single crystal with the same orientation as the starting crystal. This glass has a "memory" of the previous crystallographic orientation of the crystal from which it forms.


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