Electrical and thermal properties of K x Cu 2−x S superionic alloys


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Authors

  • К. A. Кутербеков
  • А. М. Кабышев
  • К. Бекмырза
  • М. Балапанов
  • М.М. Кубенова
  • Р. Палымбетов
  • С. Сахабаева
  • К. Куланова

DOI:

https://doi.org/10.32523/2616-6836-2020-133-4-39-48

Abstract

The paper presents and discusses the results of phase analysis and experimental studies of electronic conductivity
and thermo-electromotive force, the thermal conductivity coefficient of K x Cu 2−x S alloy samples (x=0.1, 0.2, 0.25) in the temperature range from 30 to 420 ◦ C. According to the results of x-ray phase analysis, the alloys are a mixture of different phases of copper sulfide: cubic Fm-3m phase Cu 1.84 S, cubic Fm-3m phase Cu 2 S, rhombohedral R-3m phase Cu 17 S 9 and metastable tetragonal P4 3 2 1 2 phase Cu 2 S. Differential scanning thermometry showed an endothermic peak extending from 84 to 102 ◦ C caused by phase transitions from the rhombohedral and tetragonal phases to the hexagonal phase of copper sulfide. For the composition of K 0.2 Cu 1.8 S above 300 ◦ C, a strong increase in the thermo-EMF coefficient (up to 4 mV/K)
and a decrease in thermal conductivity (from 0.87 to 0.4 W/m·K) were observed, resulting in a very high peak value of the dimensionless thermoelectric efficiency ZT=3.5 at 380 ◦ C. 

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Published

2022-07-02

How to Cite

Кутербеков К. A., Кабышев, . А. М., Бекмырза , К., Балапанов , М., Кубенова, М., Палымбетов , Р., Сахабаева , С., & Куланова, . К. (2022). Electrical and thermal properties of K x Cu 2−x S superionic alloys. BULLETIN OF THE L.N. GUMILYOV EURASIAN NATIONAL UNIVERSITY. PHYSICS. ASTRONOMY SERIES, 133(4), 39–48. https://doi.org/10.32523/2616-6836-2020-133-4-39-48

Issue

Vol. 133 No. 4 (2020)

Section

Статьи

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