Abstract
Structural studies of chemical elements in extreme pressure conditions often lead to unpredictable and surprising results. At ultra-high pressure Yuan et al. [IUCrJ (2022), 9, 253-260] report a new crystal phase of selenium that exhibits negative linear compressibility.
Highlights
In this issue of IUCrJ, Yuan et al (2022) revised the extreme pressure phase transitions in selenium and reported a hitherto unknown phase, characterized by an anomalous linear expansion in one principal direction under hydrostatic pressure
While the lighter elements – oxygen and sulfur – form molecular crystals, and polonium, the heaviest element of the group observed in nature, is metallic, both selenium and tellurium are semiconductors
According to Akahama et al (2021), the rhombohedral phase named Se-V occurs between 60 GPa and 140 GPa, where it transforms to the Se-VI b.c.c. phase, stable up to at least 317 GPa
Summary
In this issue of IUCrJ, Yuan et al (2022) revised the extreme pressure phase transitions in selenium and reported a hitherto unknown phase, characterized by an anomalous linear expansion in one principal direction under hydrostatic pressure. While the lighter elements – oxygen and sulfur – form molecular crystals, and polonium, the heaviest element of the group observed in nature, is metallic, both selenium and tellurium are semiconductors.
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