Thermoelectric properties of layered ferrocuprates LnBaCuFeO5 + δ (Ln= La, Pr, Nd, Sm, Gd-Lu)
Year: 2009
Type: article
Abstract: The electrical resistivity ρ and the thermopower S of ceramic materials LnBaCuFeO5 + δ (Ln= La, Pr, Nd, Sm, Gd-Lu) are measured in air at temperatures in the range from 300 to 1100 K. All the studied ferrocuprates are p-type semiconductors. The electrical resistivity ρ and the thermopower S of these compounds increase with a decrease in the radius of the Ln 3+ cation (with an increase in the number of 4f electrons n in Ln 3+). The nonmonotonic behavior of the dependences ρ=f(n) and S=f(n) indicates that the electrical properties of the layered ferrocuprates LnBaCuFeO5 + δ depend on the electronic configuration of the Ln 3+ cation. The power factors P calculated for the LnBaCuFeO5 + δ ceramic materials from the experimental values of ρ and S increase with increasing temperature and, at T = 1000 K, reach the maximum values P = 102.0 and 54.1 µW m−1 K−2 for Ln = Pr(4f 2) and Sm(4f 5), respectively, and become close to each other and equal to 30–35 µW m−1 K−2 for Ln = Gd(4f 7), Dy(4f 9), and Ho(4f 10).
Source: Physics of the Solid State
Author: A. I. Klyndyuk
Institution: Belarusian State Technological University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2051611724