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Applied Physics and Mathematics

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PHASE TRANSITIONS AND ELECTRICAL PROPERTIES OF NANOCRYSTALLINE COPPER SULFIDES KXCU1.85S (0 < X <0.05)
M.KH. BALAPANOV, R.KH. ISHEMBETOV, B.M. AKHMETGALIEV, M.M. KUBENOVA, K.A. KUTERBEKOV, R.SH. PALYMBETOV, S.M. SAKHABAEVA

Potassium-doped nanocrystalline semiconductor copper sulfides have been synthesized. X-ray phase analysis at room temperature showed that the samples are a mixture of different phases of copper sulfide: monoclinic djurleite (Cu1.9375S), monoclinic and hexagonal chalcocite (Cu2S). The crystallite sizes calculated from the half-width of the X-ray lines are in the range from 20 to 200 nm. The results of differential scanning calorimetry, measurements of electronic conductivity and Seebeck coefficient are presented. All samples exhibited a weak thermal effect of about 370 K and an endothermic thermal effect in the range of 670-700 K. For K0.04Cu1.85S the activation energy of electronic conductivity was 0.15 ± 0.01 eV in the range of 360–400 K.
Keywords: X-ray phase analysis, copper sulfide, phase transitions, thermoelectric, conductivity.


DOI: 10.25791/pfim.06.2021.1211

Pp. 03-07.

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