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arXiv · 2311.04332

The Pressure-Stabilized Polymorph of Indium Triiodide

Danrui Ni·Haozhe Wang·Xianghan Xu·Weiwei Xie·Robert J. Cava
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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 crystal structure, with a = 7.217 {\AA}, and c = 20.476 {\AA}, 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 variations. 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.

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Danrui Ni, Haozhe Wang, Xianghan Xu, Weiwei Xie, Robert J. Cava. 2023-11-07. The Pressure-Stabilized Polymorph of Indium Triiodide. https://arxiv.org/abs/2311.04332

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