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| Home > Publications database > High pressure structural and lattice dynamics study of $α$-In$_2$Se$_3$ |
| Journal Article | PUBDB-2025-03826 |
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2025
American Institute of Physics
Melville, NY
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Please use a persistent id in citations: doi:10.1063/5.0266372 doi:10.3204/PUBDB-2025-03826
Abstract: Layered $α$-In$_2$Se$_3$ has been studied using a combined in situ synchrotron angle-dispersive powder x-ray diffraction and Raman spectroscopy study in a diamond anvil cell up to 60+ GPa, at room temperature. Helium, which remains fairly hydrostatic up to the highest pressure in this study, was used as the pressure-transmitting medium. The results from both experimental methods reveal a pressure-induced structural phase transition from $α$-In$_2$Se$_3$ to a monoclinic $β′$-In$_2$Se$_3$ structure at ≈1 GPa, in agreement with previous studies. Based on our detailed measurements using both experimental techniques and the F–f formalism, the $β′$-In$_2$Se$_3$ structure remains stable up to 45 GPa, without a clear indication of a phase transition toward the previously reported $β$-In$_2$Se$_3$ phase. Above this pressure, $_2$Se$_3$ adopts a disordered solid-solution-like orthorhombic structure, phase IV. The results are discussed in comparison with the relevant previous studies of $α$-In$_2$Se$_3$ under pressure.
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