Magnetothermoelectric properties of the bulk extruded samples of Bi<sub>85</sub>Sb<sub>15</sub> solid solution with different grain sizes

Tagiyev M. M.

MOLECULAR CRYSTALS AND LIQUID CRYSTALS, vol.718, no.1, pp.113-121, 2021 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 718 Issue: 1
  • Publication Date: 2021
  • Doi Number: 10.1080/15421406.2020.1861528
  • Journal Name: MOLECULAR CRYSTALS AND LIQUID CRYSTALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.113-121
  • Azerbaijan State University of Economics (UNEC) Affiliated: Yes

Abstract

Bulk extruded (including nanostructured) samples of Bi85Sb15 solid solutions consisting of particles with average sizes of 0.5 x 10(5), 380, 30, and 15 nm were obtained and their electrical conductivity (sigma), thermo-e.m.f. (alpha), Hall (R-H), and thermal conductivity (chi) coefficients in the temperature range similar to 77-300 K and magnetic field strength (H) up to similar to 74 x 10(4) A/m have been investigated. With decreasing powder sizes in the samples an increase in sigma and a decrease in phonon thermal conductivity (chi l) and alpha, R-H are observed; the dependences of these parameters of the samples on the size of the powders satisfactorily correlate in the studied temperature range. As the size of the crystals decreases, the concentration of the boundaries increases, this leads to increase of electron concentration in the samples. Effect of H on the electrical and thermal properties for annealed samples of Bi85Sb15 solid solutions was stronger than for the samples that have not undergone annealing.