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Thermoelectric properties of layered ferrocuprates LnBaCuFeO5 + δ (Ln= La, Pr, Nd, Sm, Gd-Lu)

  • Semiconductors and Dielectrics
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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).

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  1. Belarussian State Technological University, ul. Sverdlova 13a, Minsk, 220050, Belarus

    A. I. Klyndyuk

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  1. A. I. Klyndyuk
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Correspondence to A. I. Klyndyuk.

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Original Russian Text © A.I. Klyndyuk, 2009, published in Fizika Tverdogo Tela, 2009, Vol. 51, No. 2, pp. 237–242.

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Klyndyuk, A.I. Thermoelectric properties of layered ferrocuprates LnBaCuFeO5 + δ (Ln= La, Pr, Nd, Sm, Gd-Lu). Phys. Solid State 51, 250–254 (2009). https://doi.org/10.1134/S1063783409020073

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  • DOI: https://doi.org/10.1134/S1063783409020073

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