Journal
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS
Volume 78, Issue -, Pages 100-106Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S2052520622001305
Keywords
synchrotron X-ray radiation; high pressure; phase transition; radiation damage; coordination polymers
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This study highlights the high-pressure phase-transition behavior of metal-organic frameworks and coordination polymers under varying degrees of X-ray irradiation. The research shows that after a certain absorbed dose threshold, pressure-induced phase transitions are suppressed, potentially due to partial amorphization and/or defect formation in the sample.
The high-pressure phase-transition behaviour of metal-organic frameworks and coordination polymers upon varying degrees of X-ray irradiation are highlighted with four example studies. These show that, in certain cases, the radiation damage, while not extreme in changing unit-cell values, can impact the existence of a phase transition. In particular, pressure-induced phase transitions are suppressed after a certain absorbed dose threshold is reached for the sample. This is thought to be due to partial amorphization and/or defect formation in the sample, hindering the co-operative structural distortions needed for a phase transition. The high-pressure experiments were conducted with several crystals within the sample chamber in order to measure crystals with minimal X-ray irradiation at the highest pressures, which are compared with the crystals measured continuously upon pressure increase. Ways to minimize radiation damage are also discussed within the frame of high-pressure experiments.
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