Abstract—The influence of the addition of nanodispersed graphene in an amount of 0.05–0.15 wt % on the ultimate compressive strength of the materials based on p-type Bi0.5Sb1.5Te3 and n-type Bi2Te2.4Se0.6 solid solutions is studied. The samples are fabricated by spark plasma sintering of the powders prepared by melt spinning and grinding in a ball mill. All samples are found to undergo brittle fracture. The microstructure of the cleavage of the p-type samples doped with graphene is lamellar, and the grains have pronounced facets. In the n-type materials, the grains have lost their facets and the graphene content increases. The p-type samples doped and undoped with graphene have the same ultimate strength, σu = 208 ± 10 MPa. The ultimate strength of the n-type samples doped with graphene is σu = 222 ± 10 MPa, and that of the plain sample is σu = 167 MPa.
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ACKNOWLEDGMENTS
The melt-spun powders were fabricated at the Sukhum Institute of Physics and Technology, Academy of Sciences of Abkhazia.
The milling of graphene-containing powders in a ball mill and the fabrication of samples by spark plasma sintering were carried out in the Laboratory of Thermoelectric Materials of AO GIREDMET.
Funding
This work was carried out within the framework of state task no. 075-00715-22–00.
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Translated by K. Shakhlevich
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Ivanova, L.D., Nikhezina, I.Y., Mal’chev, A.G. et al. Mechanical Properties of p- and n-Type Bismuth Telluride-Based Solid Solutions Doped with Graphene. Russ. Metall. 2023, 1411–1416 (2023). https://doi.org/10.1134/S0036029523100105
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DOI: https://doi.org/10.1134/S0036029523100105