Memory Glass: An Amorphous Material Formed from AlPO4

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Science  10 Aug 1990:
Vol. 249, Issue 4969, pp. 647-649
DOI: 10.1126/science.249.4969.647


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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