Issue 2, 2024

The pressure-stabilized polymorph of indium triiodide

Abstract

A layered rhombohedral polymorph of indium(III) triiodide is synthesized at high pressure and temperature. The unit cell symmetry and approximate dimensions are determined by single crystal X-ray diffraction. Its R[3 with combining macron] crystal structure, with a = 7.214 Å, and c = 20.47 Å, is refined by the Rietveld method on powder X-ray diffraction data. The crystal structure is based on InI6 octahedra sharing edges to form honeycomb lattice layers, though with considerable stacking defects. Different from ambient pressure InI3, which has a monoclinic molecular structure and a light-yellow color, high pressure InI3 is layered and has an orange color. The band gaps of both the monoclinic and rhombohedral variants of InI3 are estimated from diffuse reflectance measurements.

Graphical abstract: The pressure-stabilized polymorph of indium triiodide

Supplementary files

Article information

Article type
Communication
Submitted
11 Nov 2023
Accepted
08 Dec 2023
First published
11 Dec 2023

Dalton Trans., 2024,53, 434-438

The pressure-stabilized polymorph of indium triiodide

D. Ni, H. Wang, X. Xu, W. Xie and R. J. Cava, Dalton Trans., 2024, 53, 434 DOI: 10.1039/D3DT03771A

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