Work

AsTe3: A novel crystalline semiconductor with ultralow thermal conductivity obtained by congruent crystallization from parent glass

Year: 2024

Type: article

Abstract: The synthesis of novel narrow-band-gap semiconductors with ultralow thermal conductivity opens a pathway to the design of functional materials with high thermoelectric performance or with interesting optical sensitivity in the infrared range. Here, we report on the discovery of the novel crystalline binary AsTe 3 (c-AsTe 3 ) prepared by spark plasma sintering (SPS) from full and congruent crystallization of amorphous AsTe 3 (a-AsTe 3 ) previously prepared by twin roller quenching. X-ray diffraction suggests that the structure of c-AsTe 3 can be described as a superstructure of elementary Te with a specific distribution of As and Te atoms. More specifically, it appears as an intergrowth of a Te subunit (3 atoms) and As2Te5 subunit (6 As + 15 Te atoms) separated with interlayer spaces . The optical transmittance measured on both crystalline and amorphous AsTe 3 indicates a maximum transmittance of 22 % over the infrared range 10–25 µm. Transport properties measurements, performed between 5 and 375 K, reveal that AsTe 3 behaves as a lightly doped, p -type semiconductor. The complex crystal structure combined with a small-grain-size microstructure of the sample yields extremely low lattice thermal conductivity values of 0.35 W m −1 K −1 near 300 K. This poor ability to conduct heat is the main property that gives rise to an estimated dimensionless thermoelectric figure of merit ZT of ∼0.3 at 375 K. These findings show that the recrystallization of amorphous phases by SPS provides an effective approach for stabilizing novel phases with interesting functional properties.

Source: Journal of Alloys and Compounds

DOI: 10.1016/j.jallcom.2024.175918