Structural evolution of iodine on approach to the monatomic state

Autor:	Bykova, Elena, Batyrev, Iskander G., Bykov, Maxim, Edmund, Eric, Chariton, Stella, Prakapenka, Vitali B., Goncharov, Alexander F.
Rok vydání:	2023
Předmět:	Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.108.024104
Popis:	We applied single-crystal X-ray diffraction and Raman spectroscopy in a diamond anvil cell up to 36 GPa and first principles theoretical calculations to study the molecular dissociation of solid iodine at high pressure. Unlike previously reported, we find that the familiar Cmce molecular phase transforms to a Cmc21 molecular structure at 16 GPa, and then to an incommensurate dynamically disordered Fmmm(00{\gamma})s00 structure at 20 GPa, which can be viewed as a stepwise formation of polymeric zigzag chains of three iodine atoms following by the formation of the dynamically dissociated, incommensurately modulated i-Fmmm phase, and the truly monatomic Immm phase at higher pressures. Comment: 10 pages, 5 figures, 21 references Supplementary Information with 11 figures, 4 tables, and 6 references
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2301.05657 Zobrazit plný text záznamu View this record from Arxiv