Investigating the structural symmetrization of CsI3 at high pressures through combined X-ray diffraction experiments and theoretical analysis
- ABSTRACT: Structural evolution of cesium triiodide at high pressures has been revealed by synchrotron single-crystal X-ray diffraction. Cesium triiodide undergoes a first-order phase transition above 1.24(3) GPa from an orthorhombic to a trigonal system. This transition is coupled with severe reorganization of the polyiodide network from a layered to three-dimensional architecture. Quantum chemical calculations show that even though the two polymorphic phases are nearly isoenergetic under ambient conditions, the PV term is decisive in stabilizing the trigonal polymorph above the transition point. Phonon calculations using a non-local correlation functional that accounts for dispersion interactions confirm that this polymorph is dynamically unstable under ambient conditions. The high-pressure behavior of crystalline CsI3 can be correlated with other alkali metal trihalides, which undergo a similar sequence of structural changes upon load.
Author details: | Tomasz PorȩbaORCiDGND, Stefano RacioppiORCiD, Gaston GarbarinoORCiD, Wolfgang MorgenrothORCiDGND, Mohamed MezouarORCiD |
---|---|
DOI: | https://doi.org/10.1021/acs.inorgchem.2c01690 |
ISSN: | 0020-1669 |
ISSN: | 1520-510X |
Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/35792580 |
Title of parent work (English): | Inorganic chemistry |
Publisher: | American Chemical Society |
Place of publishing: | Washington |
Publication type: | Article |
Language: | English |
Date of first publication: | 2022/07/06 |
Publication year: | 2022 |
Release date: | 2024/04/12 |
Volume: | 61 |
Issue: | 28 |
Number of pages: | 9 |
First page: | 10977 |
Last Page: | 10985 |
Funding institution: | German BMBF [05K19IP2] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
DDC classification: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften |
Peer review: | Referiert |