Synthesis, X-ray phase analysis and differential thermal analysis of nanocrystalline superionic KxCu1.85S (x<0.05) copper sulfides
Abstract
Superionic semiconductor chalcogenides with mixed electronic-ionic conductivity have very low lattice thermal conductivity and are excellent thermoelectrics. Doping with other elements is one of the methods for optimizing the useful properties of a material. In this work, nanosized polycrystalline alloys of nonstoichiometric Cu1.85S copper sulfide with a low content of potassium are studied. The paper presents the results of X-ray phase analysis, differential thermal analysis (DTA) and electron microscopy of differential thermal analysis of KxCu1.85S alloys. The resulting alloys are a mixture of phases, in which the main share is djurleite - non-stoichiometric copper sulfide of the composition Cu1.97÷1.93S , in addition, depending on the composition of the alloy, there are impurities of monoclinic and hexagonal chalcocite Cu2S , roxbyite Cu1.81S , anilite Cu1.75S , traces of metallic copper. All alloys contain inclusions of Cu2O copper oxide. DTA detected a superionic phase transition from an ordered
low-symmetry djurleite phase to a disordered superionic hexagonal phase of copper sulfide at about 373-383 K. In addition, DTA revealed two thermal effects at about 433 K and 460 K, which are absent in binary copper sulfide. The reason for the effects may be the redistribution of impurity potassium ions in the copper sulfide lattice.
About the Authors
S. M. Sakhabayeva
L.N. Gumilyov Eurasian National University; Astana international university
Kazakhstan
Kazakhstan
Nur-Sultan
M. Kh. Balapanov
Bashkir State University
Russian Federation
Russian Federation
Ufa
K. A. Kuterbekov
L.N. Gumilyov Eurasian National University
Kazakhstan
Kazakhstan
Nur-Sultan
R. Kh. Ishembetov
Bashkir State University
Russian Federation
Russian Federation
Ufa
M. M. Kubenova
L.N. Gumilyov Eurasian National University
Kazakhstan
Kazakhstan
Nur-Sultan
Sh. G. Giniyatova
L.N. Gumilyov Eurasian National University
Kazakhstan
Kazakhstan
Nur-Sultan
S. A. Nurkenov
Astana international university
Kazakhstan
Kazakhstan
Nur-Sultan
B. M. Akhmetgaliev
Bashkir State University
Russian Federation
Russian Federation
Ufa
M. Kh. Zeleev
Bashkir State Medical University
Russian Federation
Russian Federation
Ufa
R. A. Yakshibaev
Bashkir State University
Russian Federation
Russian Federation
Ufa
G. S. Seisenbayeva
L.N. Gumilyov Eurasian National University
Kazakhstan
Kazakhstan
Nur-Sultan
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Review
Supporting agencies: This research was funded by the Science Committee of the Ministry of Education and Science of the Republic of Kazakhstan (No. AP08856636).
For citations:
Sakhabayeva S.M., Balapanov M.K., Kuterbekov K.A., Ishembetov R.K., Kubenova M.M., Giniyatova S.G., Nurkenov S.A., Akhmetgaliev B.M., Zeleev M.K., Yakshibaev R.A., Seisenbayeva G.S. Synthesis, X-ray phase analysis and differential thermal analysis of nanocrystalline superionic KxCu1.85S (x<0.05) copper sulfides. Eurasian Journal of Physics and Functional Materials. 2022;6(1):71-84. https://doi.org/10.32523/ejpfm.2022060107
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