Thermal conductivity of new nanocomposite superionic semiconductors K0.01Cu1.96S, K0.02Cu1.95S, K0.03Cu1.94S, K0.04Cu1.93S, K0.05Cu1.94S
https://doi.org/10.32523/ejpfm.2023070307
Abstract
In this work, we investigated the effect of nanostructuring on the thermoelectric and thermal properties of nonstoichiometric solid splavs doped with copper sulfides with potassium. The synthesized alloys K0.01Cu1.96S, K0.02Cu1.95S, K0.03Cu1.94S, K0.04Cu1.93S, K0.05Cu1.94S are nanocomposite. The crystallite sizes of the synthesized powder, as estimated from the half-width of X-ray diffraction lines, range from 7 to 180 nm. Sample K0.01Cu1.96S is a mixture of phases consisting of chalcocite Cu2S (82%), jarleite Cu1.96S (12%), anilite Cu1.75S (6%). The composition of samples K0.02Cu1.95S and K0.03Cu1.94S includes the most common phases of copper sulfides - chalcocite Cu2S , jarleite Cu1.96S, digenite Cu1.80S. Samples K0.04Cu1.93S and K0.05Cu1.94S consist of jarleite Cu1.96S, digenite Cu1.80S and potassium copper sulfide KCu4S3 phases. In a practical sense, the extremely low thermal conductivity values (from 0.16 to 0.80 W/m · K) found in the range of 300–700 K for nanocomposite samples K0.02Cu1.95S and K0.03Cu1.94S are very favorable for achieving high thermoelectric figure of merit ZT material.
Supporting agencies: The Science Committee of the Republic of Kazakhstan, which is part of the Ministry of Science and Higher Education, provided funding for this research (No. AP14871197).
About the Authors
M. M. Kubenova
L.N. Gumilyov Eurasian National University
Kazakhstan
Kazakhstan
Astana
M. Kh. Balapanov
Ufa University of Science and Technology
Russian Federation
Russian Federation
Ufa
R. Kh. Ishembetov
Ufa University of Science and Technology
Russian Federation
Russian Federation
Ufa
K. A. Kuterbekov
L.N. Gumilyov Eurasian National University
Kazakhstan
Kazakhstan
Astana
R. F. Almukhametov
Ufa University of Science and Technology
Russian Federation
Russian Federation
Ufa
K. Zh. Bekmyrza
L.N. Gumilyov Eurasian National University
Kazakhstan
Kazakhstan
Astana
A. M. Kabyshev
L.N. Gumilyov Eurasian National University
Kazakhstan
Kazakhstan
Astana
R. Sh. Palymbetov
L.N. Gumilyov Eurasian National University
Kazakhstan
Kazakhstan
Astana
L. U. Taimuratova
Caspian University of Technology and Engineering named after Sh. Yessenov
Kazakhstan
Kazakhstan
Aktau
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Review
For citations:
Kubenova M.M., Balapanov M.Kh., Ishembetov R.Kh., Kuterbekov K.A., Almukhametov R.F., Bekmyrza K.Zh., Kabyshev A.M., Palymbetov R.Sh., Taimuratova L.U. Thermal conductivity of new nanocomposite superionic semiconductors K0.01Cu1.96S, K0.02Cu1.95S, K0.03Cu1.94S, K0.04Cu1.93S, K0.05Cu1.94S. Eurasian Journal of Physics and Functional Materials. 2023;7(3):197-206. https://doi.org/10.32523/ejpfm.2023070307
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