Strongly Modified Mechanical Properties and Phase Transition in AlPO₄-17 Due to Insertion of Guest Species at High Pressure.

ABSTRACT: The porous aluminophosphate AlPO₄-17 with a hexagonal erionite structure, exhibiting very strong negative thermal expansion, anomalous compressibility, and pressure-induced amorphization, was studied at high pressure by single-crystal and powder X-ray diffraction in the penetrating pressure transmitting media N₂, O₂, and Ar. Under pressure, these guest species were confirmed to enter the pores of AlPO₄-17, thus completely modifying its behavior. Pressure-induced collapse in the xy plane of AlPO₄-17 no longer occurred, and this plane exhibited close to zero area compressibility. Pressure-induced amorphization was also suppressed as the elastic instability in the xy plane was removed. Crystal structure refinements at a pres

SUBMITTER: Alabarse FG 

PROVIDER: S-EPMC10389779 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature