Open AccessТермоэлектрические свойства нанокомпозитов Sb-=SUB=-2-=/SUB=-Te-=SUB=-3-=/SUB=- c графитом
Author(s) -
V.A. Kulbachinskii,
В. Г. Кытин,
Д.А. Зиновьев,
Н.В. Маслов,
Priyankar Singha,
S. Das,
Aritra Banerjee
Publication year - 2019
Publication title -
fizika i tehnika poluprovodnikov
Language(s) - English
Resource type - Journals
eISSN - 1726-7315
pISSN - 0015-3222
DOI - 10.21883/ftp.2019.05.47555.13
Subject(s) - graphite , materials science , seebeck coefficient , analytical chemistry (journal) , nanocomposite , thermoelectric effect , thermal conductivity , electrical resistivity and conductivity , atmospheric temperature range , thermoelectric materials , crystallography , mineralogy , chemistry , nanotechnology , metallurgy , thermodynamics , composite material , physics , chromatography , engineering , electrical engineering
Antimony-telluride-based nanocomposite samples containing different weight fractions of graphite (Sb_2Te_3 + x % graphite, where x = 0.0, 0.5, 1.0, and 2.5%) are synthesized and studied. The samples are produced by a solid-state reaction with the use of a ball mill. X-ray diffraction measurements show that the Sb_2Te_3 phase is present in the nanocomposites. All of the diffraction peaks are identified as corresponding to the rhombohedral structure of symmetry $$R\bar {3}m$$ . No additional peaks related to graphite are observed because of its low content. Moreover, the X-ray data show the insolubility of graphite in Sb_2Te_3: the peaks related to Sb_2Te_3 remain unchanged upon the addition of graphite. The thermal conductivity, thermoelectric power, and resistivity of the samples are studied in the temperature range 80 K ≤ T ≤ 320 K. The thermal conductivity k of the nanocomposite decreases several times compared to the thermal conductivity of single-crystal Sb_2Te_3 and reaches k ≈ 0.95 W m^–1 K^–1 at x = 0.5%. The parameter k unsteadily depends on the content of graphite. The thermoelectric power of the nanocomposites with graphite at x = 1.0% is higher compared to that of nanostructured Sb_2Te_3.