AI Article Synopsis
- - A new layered form of indium(III) triiodide is created under high pressure and temperature, showing a rhombohedral structure.
- - Its crystal dimensions and symmetry are analyzed using techniques like single crystal X-ray diffraction and the Rietveld method on powder X-ray data, revealing a honeycomb lattice of InI octahedra with stacking defects.
- - Unlike the lighter yellow form of InI found at normal pressure, this high-pressure version is orange and features different electronic properties, as indicated by distinct band gaps measured from reflectance tests.
Article 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 3̄ crystal structure, with = 7.214 Å, and = 20.47 Å, is refined by the Rietveld method on powder X-ray diffraction data. The crystal structure is based on InI octahedra sharing edges to form honeycomb lattice layers, though with considerable stacking defects. Different from ambient pressure InI, which has a monoclinic molecular structure and a light-yellow color, high pressure InI is layered and has an orange color. The band gaps of both the monoclinic and rhombohedral variants of InI are estimated from diffuse reflectance measurements.
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| http://dx.doi.org/10.1039/d3dt03771a | DOI Listing |
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