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Pressure induced amorphization provides a distinct route to prepare novel amorphous materials. Single crystals of the porous aluminophosphate AlPO4-17 directly transform to an amorphous state beginning at 0.6 GPa, without fragmentation into polycrystalline material. Apart from a reduction in dimensions, the amorphous material retains the form of the initial single crystal. Remnant crystalline domains in the amorphous material also preserve the initial ori-entation of the single crystal. X-ray diffraction indicates the compression of the structure around the empty pores in the xy plane and such an amorphization mechanism is consistent with a direct structural relationship between the single crystal and amorphous forms. The collapse of the initial pore volume is almost complete at 2.5 GPa. A memory effect is observed in the amorphous form, which strongly expands on decompression. The present process opens the way for the synthesis of topologically-ordered amorphous materials approaching “perfect glasses” with improved mechanical properties.

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  This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry Letters, copyright © 2024 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see　https://doi.org/10.1021/acs.jpclett.4c00853.

Keyword: AlPO4‑17, high pressure, memory effect

Date published: 2024-05-02

Publisher: American Chemical Society (ACS)

Journal:

• The Journal of Physical Chemistry Letters (ISSN: 19487185) p. 4612-4615

Funding:

• Elettra-Sincrotrone Trieste

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4489

First published URL: https://doi.org/10.1021/acs.jpclett.4c00853

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Updated at: 2025-04-20 17:43:48 +0900

Published on MDR: 2025-04-20 17:42:51 +0900