Interlayer-glide-driven isosymmetric phase transition in compressed In{sub 2}Se{sub 3}
- State Key Laboratory for Superhard Materials, Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012 (China)
- Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas 79409 (United States)
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203 (China)
- Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015 (United States)
We report an anomalous phase transition in compressed In{sub 2}Se{sub 3}. The high-pressure studies indicate that In{sub 2}Se{sub 3} transforms to a new isosymmetric R-3m structure at 0.8 GPa whilst the volume collapses by ∼7%. This phase transition involves a pressure-induced interlayer shear glide with respect to one another. Consequently, the outer Se atoms of one sheet locate into the interstitial sites of three Se atoms in the neighboring sheets that are weakly connected by van der Waals interaction. Interestingly, this interlayer shear glide changes the stacking sequence significantly but leaves crystal symmetry unaffected. This study provides an insight to the mechanisms of the intriguing isosymmetric phase transition.
- OSTI ID:
- 22300149
- Journal Information:
- Applied Physics Letters, Vol. 104, Issue 21; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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