Crystal Growth, Structure, Resistivity, Magnetic, and Photoelectric Properties of One‐Dimensional Selenometallate Ba₂BiFeSe₅

Abstract

Low‐dimensional materials have attracted extensive research interest in recent years owing to their interesting structural chemistry and physical properties, which will greatly deepen our knowledge of these materials and could lead to additional breakthroughs in the future. Herein we have synthesized and characterized Ba₂BiFeSe₅, which adopts a quasi‐one‐dimensional structure and possesses some fascinating physical properties. The sharp divergences between the field‐cooled (FC) and the zero‐field‐cooled (ZFC) data and the rather small magnetic moment per Fe³⁺ (0.07 μ_B) strongly suggest that the title compound is weakly ferromagnetic with a high magnetic transition temperature above room temperature, which is controlled by competing super‐exchange interactions within and between [FeBiSe₅]_∞ anionic ladders. Moreover, with its narrow bandgap of 0.95 eV, Ba₂BiFeSe₅ shows photoelectric properties with a photocurrent density of approximately 30 mA cm² at 5 V. Our study demonstrates that Ba₂FeBiSe₅ might be a new type of multifunctional material that deserves further investigation.