Thermoelectric Properties of an Extruded ZrO2-Modified Bi0.85Sb0.15 Solid Solution

• Published in: Inorganic materials 2023-08, Vol.59 (8), p.805-812
• Main Authors: Tagiyev, M. M., Abdullayeva, I. A., Abdinova, G. D., Aliyeva, Kh. F.
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Materials Science
• ISSN: 0020-1685; 1608-3172
• DOI: 10.1134/S0020168523080162

— The electrical conductivity (σ), thermoelectric power (α), Hall coefficient ( R H ), and thermal conductivity (κ) of unmodified and 0.5 wt % ZrO 2 -modified extruded samples of the Bi 0.85 Sb 0.15 solid solution have been measured in the range ~77–300 K at a magnetic field strength of up to ~74 × 10 4 A/m. The results demonstrate that the addition of 0.5 wt % ZrO 2 to Bi 0.85 Sb 0.15 reduces the phonon component of its thermal conductivity, leading to an increase in its thermoelectric figure of merit ( Z ) to ~6.4 × 10 –3 K –1 . The use of the modified material is expected to considerably improve parameters of related low-temperature thermoelectric converters. At ~77 K, in both the unmodified and ZrO 2 -modified Bi 0.85 Sb 0.15 solid solutions heat is transported largely by lattice vibrations.