Abstract
We studied the microstructure and the thermoelectric properties of the materials based on p-type germanium telluride doped with copper and bismuth and obtained by hot pressing of three type powders prepared by ingot grinding in a planetary mill, their sizes being from hundreds of microns (0.315-mm cell) to hundreds of nanometers (mechanical activation) and by melt spinning. We studied the microstructure, the chips and the composition of the samples by optical and scanning electron microscopy. By the diffractometric and the micro X-ray phase analyses, we revealed the presence of copper oxide and germanium precipitation in the samples. The samples obtained from the powder prepared by the mechanical activation had the largest number of grains with the sizes less than units of microns. We measured the following thermoelectric parameters of the materials: the Seebeck coefficient and the specific electrical and thermal conductivity within the temperature range of 300–800 K. We calculated the coefficient of thermoelectric efficiency ZT; the hot-pressed samples obtained from the powders produced by the melt spinning had the highest value: ZT = 1.5 at 600 K.
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REFERENCES
Iordanishvili, E.K., Termoelektricheskie istochniki pitaniya (Thermoelectric Power Supplies), Moscow: Sov. Radio, 1971.
Ohotin, A.S., Efremov, A.A., Ohotin, V.S., and Pushkarskiy, A.S., Termoelektricheskie generatory (Thermoelectric Generators), Moscow: Atomizdat, 1971.
Korzhuev, M.A., Tellurid germaniya i ego fizicheskie svoistva (Germanium Telluride and Its Physical Properties), Moscow: Nauka, 1986.
Abrikosov, N.Kh. and Shelimova, K.E., Poluprovodnikovye materialy na osnove soedinenii A IV B VI (Semiconductor Materials Based on AIVBVI Compounds), Moscow: Nauka, 1975.
Hein, R.A., Gibson, J.W., Mazelsky, R., Miller, R.C., and Hulm, J.K., Superconductivity in germanium telluride, Phys. Rev. Lett., 1964, vol. 12, no. 12, pp. 320–322.
Sysoeva, L.M., Lev, E.Ya., and Kolomoets, N.V., About the energy spectrum of carriers in telluride germany, Fiz. Tverd. Tela, 1966, vol. 7, no. 7, pp. 2223–2226.
Anisimov, B.B., Djamagidze, Ch.Z., Kutsiya, A.A., Pechkov, A.N., Red’ka, N.S., and Shvangiradze, R.R., Effect of the α–γ transformation on the electrical and optical properties of GeTe, Neorg. Mater., 1984, vol. 20, no. 7, pp. 1098–1102.
Abrikosov, N.Kh. and Danilova-Dobryakova, G.T., Investigation of the area of bismuth solid solutions in telluride germany, Neorg. Mater., 1972, vol. 8, no. 5, pp. 808–810.
Abrikosov, N.Kh., Karpinskiy, O.G., Makalatiya, T.Sh., and Shelimova, L.E., Doping of germanium telluride with copper and compound Cu2Te, Neorg. Mater., 1982, vol. 18, no. 4, pp. 586–590.
Abrikosov, N.Kh., Karpinskiy, O.G., Makalatiya, T.Sh., and Shelimova, L.E., Doping of germanium telluride with bismuth tellurides, Neorg. Mater., 1981, vol. 17, no. 12, pp. 2168–2175.
Abrikosov, N.Kh., Karpinskiy, O.G., Makalatiya, T.Sh., and Shelimova, L.E., Doping of germanium telluride with bismuth and copper, Neorg. Mater., 1982, vol. 18, no. 9, pp. 1504–1509.
Gruzinov, B.F., Konstantinov, P.P., Lev, E.R., and Sysoeva, L.M., Influence of copper impurity on kinetic effects in rhombohedral and cubic modification GeTe, Neorg. Mater., 1980, vol. 16, no. 1, pp. 31–36.
Hazan, E., Madar, N., Parag, M., Casian, Dr.V., Ben-Yehuda, and Gelbstein, Y., Effective electronic mechanisms for optimizing the thermoelectric properties of GeTe-rich alloys, Adv. Electron. Mater., 2015, vol. 1, no. 11, art. ID 1500228.
Vedeneev, V.P., Zaldastanishvili, M.I., Krivoruchko, S.P., Kovyrzin, A.V., Sabo, E.P., Sudak, N.M., and Chilikidi, A.A., Segmented branches for a temperature range of 300–750 K, in Termoelektriki i ikh primenenie (Thermoelectrics and Their Applications), St. Petersburg, 1999, pp. 231–235.
Hicks, L.D. and Dresselhaus, M.S., Effect of quantum-well structure on thermoelectric figure of merit, Phys. Rev. B, 1993, vol. 47, no. 19, pp. 12727–12731.
Ravich, Yu.I., Efimova, B.A., and Smirnov, I.A., Metody issledovaniya poluprovodnikov v primenenii k khal’kogenidam svintsa (Methods of Research of Semiconductors in Application to Lead Chalcogenides), Moscow: Nauka, 1968.
Shelimova, L.E., Karpinskiy, O.G., Avilov, E.S., and Kretova, M.A., Crystal structure, phase transitions and mechanical properties of GeTe-based solid solutions in GeTe– PbTe–MTe systems (M–Mn, Sc, La), Neorg. Mater., 1993, vol. 27, no. 11, pp. 1449–1457.
Gogishvili, O.Ch., Kononyxin, V.S., and Lalykin, S.P., Density of GeTe prepared by metal-ceramic method, Neorg. Mater., 1975, vol. 12, no. 12, pp. 2145–2147.
Goltsman, B.M., Kudinov, V.A., and Smirnov, I.A., Poluprovodnikovye termoelektricheskie materialy na osnove Bi 2 Te 3 (Semiconductor Thermoelectric Materials Based on Bi2Te3), Moscow: Nauka, 1972.
Zaldastanishvili, M.I., Krivoruchko, S.P., Sabo, E.P., Sudak, N.M., and Chilikidi, A.A., Influence of hot pressing and heat treatment conditions on the properties of Ge0.97Bi0.03Te doped with copper, in Termoelektriki i ikh primenenie (Thermoelectrics and Their Applications), St. Petersburg, 2004, pp. 270–275.
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This work was performed according to the State Assignment no. 075-00947-20-00.
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Ivanova, L.D., Granatkina, Y.V., Nikhezina, I.Y. et al. Thermoelectric Properties of Fine-Grained Germanium Telluride. Inorg. Mater. Appl. Res. 12, 347–353 (2021). https://doi.org/10.1134/S2075113321020192
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DOI: https://doi.org/10.1134/S2075113321020192