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High-Temperature-Phase Bi₄RhI₂: Electronic Localization by Structural Distortion.

Bertold Rasche¹, Michael Ruck^1,2

¹Department of Chemistry and Food Chemistry , TU Dresden , Dresden , Germany.

Inorganic Chemistry

|April 10, 2018

Summary

This summary is machine-generated.

A new metal-rich compound, Bi4RhI2, was discovered with a unique strand-like crystal structure. This structure, featuring rhodium-bismuth chains and iodide ions, exhibits a narrow band gap, suggesting potential for unusual physical phenomena.

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Area of Science:

Solid-state chemistry and materials science
Crystallography and structural analysis
Topological materials research

Background:

Exploration of the bismuth-rhodium-iodide (Bi-Rh-I) ternary phase system.
Previous discovery of the topological insulator Bi14Rh3I9 (Bi4.67RhI3).
Understanding of structure-property relationships in intermetallic compounds.

Purpose of the Study:

To discover and characterize new compounds within the Bi-Rh-I phase system.
To elucidate the crystal structure and bonding characteristics of the novel compound Bi4RhI2.
To investigate the electronic properties and potential for unique physical phenomena in Bi4RhI2.

Main Methods:

Single-crystal X-ray diffraction for crystal structure determination.
Electron localizability indicator (ELI) for chemical bonding analysis.
Band structure calculations and electrical resistivity measurements.

Main Results:

Discovery of the metal-rich compound Bi4RhI2, a high-temperature phase forming peritectically at 441 °C.
Determination of a monoclinic crystal structure featuring infinite strands of [RhBi8/2]2+ antiprisms separated by iodide ions.
Identification of complex covalent bonding between Rh-Bi and Bi-Bi atoms, and a narrow band gap of 157 meV.

Conclusions:

Bi4RhI2 represents a new intermetallic compound with a unique strand-like structure related to topological insulators.
The observed bonding and electronic structure provide insights into the formation of this structural motif.
The strandlike structure type is associated with unusual physical phenomena, including potential charge-density-wave transitions.