Electron Transport in Perovskite-Type Ca0.5 – xSr0.5LuxMnO3 – δ Manganites

E. I. Konstantinova; Константинова Е. И.; V. A. Litvinov; Литвинов В. А.; A. D. Koryakov; Коряков А. Д.; I. A. Leonidov; Леонидов И. А.

doi:10.31857/S0044457X23600536

Electron Transport in Perovskite-Type Ca0.5 – xSr0.5LuxMnO3 – δ Manganites

Autores: Konstantinova E.¹, Litvinov V.¹, Koryakov A.¹, Leonidov I.¹
Afiliações:
1. Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences
Edição: Volume 68, Nº 10 (2023)
Páginas: 1398-1404
Seção: СИНТЕЗ И СВОЙСТВА НЕОРГАНИЧЕСКИХ СОЕДИНЕНИЙ
URL: https://journals.rcsi.science/0044-457X/article/view/140305
DOI: https://doi.org/10.31857/S0044457X23600536
EDN: https://elibrary.ru/LSXZZL
ID: 140305

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Resumo

Perovskite-type Ca0.5 – xSr0.5LuxMnO3 – δ (x = 0.05, 0.10, 0.15, and 0.20) manganites have been prepared in air using a citrate–nitrate process for preparing precursors. At room temperature, the x = 0.05, 0.10, and 0.15 samples have an orthorhombic structure (space group Pbnm); when x = 0.2, a tetragonal structure (space group I4/mcm) is formed. The increase in unit cell volume in response to rising lutetium concentration in the samples is due to an increase in Mn3+ concentration necessary to ensure n-type electrical conductivity σ. The temperature-activated electrical conductivity is consistent with the adiabatic transport mechanism of small polarons. The increase in magnitude of the Seebeck coefficient S in response to rising temperature is due to the decrease in the concentration of Mn3+ ions via their disproportionation to Mn2+ and Mn4+ ions. The S(T) and σ(T) temperature dependences under the condition where δ ⁓ 0 have been used to calculate the equilibrium constants of the disproportionation reaction, charge carrier concentrations and mobilities.

Palavras-chave

manganites, perovskite, electrical conductivity, Seebeck coefficient

Bibliografia

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