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$AgSn[Bi_{1−x}Sb_{x}]Se_{3}$: Synthesis, Structural Characterization, and Electrical Behavior
| Content Provider | MDPI |
|---|---|
| Author | Paulina, Valencia-Gálvez Mar, ía López Inmaculada, Álvarez-Serrano Antonio, Galdámez Delgado, Daniela Moris, Silvana |
| Copyright Year | 2021 |
| Description | Herein, we report the synthesis, characterization, and electrical properties of lead-free $AgSn_{m}[Bi_{1−x}Sb_{x}]Se_{2+m}$ (m = 1, 2) selenides. Powder X-ray diffraction patterns and Rietveld refinement data revealed that these selenides consisted of phases related to NaCl-type crystal structure. The microstructures and morphologies of the selenides were investigated by backscattered scanning electron microscopy, energy-dispersive X-ray spectroscopy, and high-resolution transmission electron microscopy. The studied $AgSn_{m}[Bi_{1−x}Sb_{x}]Se_{2+m}$ systems exhibited typical p-type semiconductor behavior with a carrier concentration of approximately $~+10^{20}$ $cm^{−3}$. The electrical conductivity of $AgSn_{m}[Bi_{1−x}Sb_{x}]Se_{2+m}$ decreased from ~3.0 to $~10^{−3}$ $S·cm^{−1}$ at room temperature (RT) with an increase in m from 1 to 2, and the Seebeck coefficient increased almost linearly with increasing temperature. Furthermore, the Seebeck coefficient of $AgSn[Bi_{1−x}Sb_{x}]Se_{3}$ increased from ~+36 to +50 $μV·K^{−1}$ with increasing Sb content (x) at RT, while its average value determined for $AgSn_{2}[Bi_{1−x}Sb_{x}]Se_{4}$ was approximately ~+4.5 $μV·K^{−1}$. |
| Starting Page | 864 |
| e-ISSN | 20734352 |
| DOI | 10.3390/cryst11080864 |
| Journal | Crystals |
| Issue Number | 8 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-07-26 |
| Access Restriction | Open |
| Subject Keyword | Crystals Condensed Matter Physics Selenides Seebeck Coefficient Lead-free Thermoelectric Materials |
| Content Type | Text |
| Resource Type | Article |
