Thermoelectric properties of the layered oxides LnBaCu(Co)FeO₅₊δ(Ln = La, Nd, Sm, Gd)
The crystal structure, electrical conductivity and thermo-e.m.f. of layered oxides LnBaCu(Co)FeO₅₊δ(Ln=La, Nd, Sm, Gd) of perovskite structure have been studied. The LnBaCu(Co)FeO₅₊δ compounds have cubic structure for Ln = La and tetragonal one for the Ln = Nd-Gd and are p-type semiconductors (excep...
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| Date: | 2009 |
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| Main Authors: | , |
| Format: | Article |
| Language: | English |
| Published: |
НТК «Інститут монокристалів» НАН України
2009
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| Series: | Functional Materials |
| Subjects: | |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Thermoelectric properties of the layered oxides LnBaCu(Co)FeO₅₊δ(Ln = La, Nd, Sm, Gd) // A.I. Klyndyuk, Ye.A. Chizhova // Functional Materials. — 2009. — Т. 16, № 1. — С. 17-22. — Бібліогр.: 22 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Summary: | The crystal structure, electrical conductivity and thermo-e.m.f. of layered oxides LnBaCu(Co)FeO₅₊δ(Ln=La, Nd, Sm, Gd) of perovskite structure have been studied. The LnBaCu(Co)FeO₅₊δ compounds have cubic structure for Ln = La and tetragonal one for the Ln = Nd-Gd and are p-type semiconductors (except for LaBaCoFeO₅₊δ having negative S values). The activation energy of electric transport, thermoelectric coefficients (Seebeck, Pel tier and Thomson) and the power factor of the oxides studied have been determined. The power factor of LnBaCu(Co)FeO₅₊δ phases has been found to depend on the nature of rare earth elements and 3d-metals in their structure and to be maximum for SmBaCuFeO₅₊δ, GdBaCuFeO₅₊δ and NdBaCoFeO₅₊δ. The layered perovskites can be considered as a base for development of the new thermoelectric oxide materials. |
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