Crystal structure and properties of novel oxide Sm 0.9 Ca 1.1 Fe 0.7 Co 0.3 O 4-d

Anastasia P. Galayda; Nadezhda E. Volkova; Anastasia I. Dyagileva; Ludmila Ya. Gavrilova; Vladimir A. Cherepanov; Peter D. Battle

doi:10.15826/chimtech.2018.5.4.01

Crystal structure and properties of novel oxide Sm_0.9Ca_1.1Fe_0.7Co_0.3O_4-d

Anastasia P. Galayda, Nadezhda E. Volkova, Anastasia I. Dyagileva, Ludmila Ya. Gavrilova, Vladimir A. Cherepanov, Peter D. Battle

Abstract

Sm_0.9Ca_1.1Fe_0.7Co_0.3O_4-δ oxide with the K₂NiF₄-type structure was prepared using a glycerin-nitrate technique. The XRD pattern of Sm_0.9Ca_1.1Fe_0.7Co_0.3O_4-δ was refined by the Rietveld method within an orthorhombic structure (space group Bmab). The electrical conductivity, Seebeck coefficient, and thermal expansion of Sm_0.9Ca_1.1Fe_0.7Co_0.3O_4-δ were measured depending on temperature in air. The change of oxygen nonstoichiometry determined by TGA in air does not exceed 0.01. The oxygen content in Sm_0.9Ca_1.1Fe_0.7Co_0.3O_4-δ determined by the reduction in a hydrogen flux is equal to 3.96 ± 0.01. The positive value of Seebeck coefficient indicates that the predominant charge carriers in the oxide studied are electron holes.

Keywords

complex oxide; Ruddlesden-Popper phase; crystal structure; oxygen nonstoichiometry, electroconductivity; thermal expansion

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DOI: https://doi.org/10.15826/chimtech.2018.5.4.01

Copyright (c) 2018 Anastasia P. Galayda, Nadezhda E. Volkova, Anastasia I. Dyagileva, Ludmila Ya. Gavrilova, Vladimir A. Cherepanov, Peter D. Battle