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

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Дәйексөз келтіру

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Аннотация

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.

Авторлар туралы

E. Konstantinova

Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences

Email: leonidov@imp.uran.ru
620990, Yekaterinburg, Russia

V. Litvinov

Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences

Email: leonidov@imp.uran.ru
620990, Yekaterinburg, Russia

A. Koryakov

Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences

Email: leonidov@imp.uran.ru
620990, Yekaterinburg, Russia

I. Leonidov

Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: leonidov@imp.uran.ru
620990, Yekaterinburg, Russia

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© И.А. Леонидов, Е.И. Константинова, В.А. Литвинов, А.Д. Коряков, 2023

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