Funct. Mater. 2023; 30 (3): 344-349.
Effect of sample preparation method on the manifestation of percolation phenomena in the thermoelectric properties of (Bi1-xSbx)2Te3 solid solutions in the range x = 0.93-1.00
National Technical University Kharkiv Polytechnic Institute, 2 Kyrpychova St., 61002 Kharkiv, Ukraine
The purpose of the present work was to find out how the method of sample preparation influences the character of the manifestation of the percolation transition. We obtained the room temperature dependences of electrical conductivity, the Seebeck coefficient, and the TE power factor on the composition of (Bi1-xSbx)2Te3 solid solutions (x = 1-0.93) for samples pressing and subjected to long-term aging and ones prepared by other methods. The percolation effects were observed for all samples irrespective of the preparation technique, although the concentration region and the character of their manifestation differed from what we observed earlier for rapidly cooled cast alloys. In addition, in the aged samples, one more peak at x ~ 0.965 was detected and attributed to the processes of self-organization in the solid solution occurring after reaching the percolation threshold.
1. Thermoelectric Handbook, Macro to Nano, ed. by D.M.Rowe, CRC Press, Taylor & Francis Group, Boca Raton (2006).
2. Materials Aspect of Thermoelectricity, ed. by C.Uher, CRC Press, Boca Raton (2016)
3. H.J.Goldsmid, Introduction to Thermoelectricity, Springer-Verlag Berlin Heidelberg: Berlin, Heidelberg, Germany (2016).
4. E.I.Rogacheva, Jpn. J. Appl. Phys., 32, 775 (1993).
https://doi.org/10.7567/JJAPS.32S3.775
5. E.I.Rogacheva, J. Thermoelectricity, 2, 61 (2007).
6. E.I.Rogacheva, O.N.Nashchekina, Percolation Effects in Semiconductor IV-VI-based Solid Solutions and Thermoelectric Materials Science. In: Advanced Thermoelectric Materials, ed. Ch.R.Park, John Willey & Sons (2019).
https://doi.org/10.1002/9781119407348.ch9
7. D.Stauffer, A.Aharony, Introduction to Percolation Theory, Taylor & Francis, London/Washington, DC (1992).
8. B.I.Shklovskii, A.L.Efros, Electronic Properties of Doped Semiconductors, Springer, Berlin, Heidelberg (1984).
https://doi.org/10.1007/978-3-662-02403-4
9. E.I.Rogacheva, J. Phys. Chem. Sol., 64, 1579 (2003).
https://doi.org/10.1016/S0022-3697(03)00245-2
10. E.I.Rogacheva, Phys. Stat. Sol. C, 6, 1307 (2009).
11. H.Scherrer, Bismuth Telluride, Antimony Telluride and their Solid Solution, in: CRC Handbook of thermoelectric. ed. by D.M.Rowe, London, New York, Washington, CRC Press, Boca Raton, D.C. (1995).
https://doi.org/10.1201/9781420049718.ch19
12. K.Martynova, E.Rogacheva, Funct. Mater., 25, 54 (2018).
https://doi.org/10.15407/fm25.01.054
13. E.I.Rogacheva, K.V.Martynova, A.S.Bondarenko, J. Thermoelectricity, 5, 47 (2016).
14. E.Rogacheva., O.Nashchekina, E.Martynova, J. Phys. Conf. Series, 864, 012027(1-4) ( 2017).
https://doi.org/10.1088/1742-6596/864/1/012027
15. E.I.Rogacheva, K.V.Martynova, O.N.Nashchekina, Yu.V.Men'shov, Funct. Mater., 30, 149 (2023).
https:// doi.org/10.15407/fm30.02.149