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Effect of heterovalent substitutions in the Cu and Fe sites on the thermal expansion and electrical properties of the layered ferrocuprate LaBaCuFeO5 + δ

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Abstract

We have synthesized LaBa(Cu,Fe,M)2O5 + δ (M = Mn, Co, Ni, Zn, Nb, W) solid solutions, determined their lattice parameters, and measured their thermal expansion, electrical conductivity, and thermoelectric power from 300 to 1100 K in air. The results demonstrate that the linear thermal expansion coefficient of the LaBa (Cu, Fe, M)2O5 + δ solid solutions is larger than that of LaBaCuFeO5 + δ. The conductivity of the ferrocuprates increases with Cu3+ content, reaching a maximum in the LaBaCu0.9Co0.1FeO5 + δ solid solution (}~90 S/cm near 670 K). The carrier excitation energy in LaBa(Cu, Fe, M)2O5 + δ is 0.01–0.03 eV and depends little on the nature of the Mz+ cation substituting for Cu2+ or Fe3+, whereas the charge transport energy increases with difference in charge state between the host and substituent cations.

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Authors and Affiliations

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

    A. I. Klyndyuk & E. A. Chizhova

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  1. A. I. Klyndyuk
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  2. E. A. Chizhova
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Correspondence to A. I. Klyndyuk.

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Original Russian Text © A.I. Klyndyuk, E.A. Chizhova, 2008, published in Neorganicheskie Materialy, 2008, Vol. 44, No. 7, pp. 867–870.

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Klyndyuk, A.I., Chizhova, E.A. Effect of heterovalent substitutions in the Cu and Fe sites on the thermal expansion and electrical properties of the layered ferrocuprate LaBaCuFeO5 + δ . Inorg Mater 44, 762–765 (2008). https://doi.org/10.1134/S0020168508070157

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  • DOI: https://doi.org/10.1134/S0020168508070157

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