Dresden 2026 – wissenschaftliches Programm

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FM: Fachverband Funktionsmaterialien

FM 11: Poster Session Functional Materials

FM 11.1: Poster

Dienstag, 10. März 2026, 18:00–20:30, P4

Structural and Optical Characterization of FeGaInS* Layered Crystals — •Zeynab Addayeva and Mustafa Muradov — Baku State University, Baku , Azerbaijan

FeGaInS4 layered crystals were synthesized using the Bridgman technique, and their crystal structure was investigated via powder X-ray diffraction (XRD). FeGaInS4 is a quaternary complex metal chalcogenide that belongs to the class of layered, quartz-like A-B-C-X4 type compounds. The material crystallizes in the rhombohedral system and adopts the R3m (No. 160) space group, according to the International Union of Crystallography (IUCr) classification. The refined lattice parameters (a = b = 5.406 Å, c = 10.708 Å) confirm the presence of a highly symmetric and anisotropic layered crystal structure. Within the structure, Fe, Ga, and In atoms occupy different coordination environments and form tetrahedral bonds with sulfur (S) anions, resulting in a complex three-dimensional network. These bonding interactions directly influence the material's electronic structure and related functional properties, including electrical conductivity, optical absorption, dielectric response, and thermal stability. Due to its anisotropic layered architecture, FeGaInS4 exhibits natural cleavage along specific crystallographic directions. This property renders it suitable for exfoliation into few-layer or monolayer nanosheets, making it a promising candidate for the fabrication of two-dimensional (2D) materials and high-performance composite systems. The optical band gap of FeGaInS4 is approximately 1.46 eV.

Keywords: X-ray diffraction; FeGaInS₄; two-dimensional (2D) materials