Phase equilibria, crystal structure and properties of complex oxides in the Nd2O3-SrO-CoO system

T. V. Aksenova; T. G. Efimova; O. I. Lebedev; Sh. I. Elkalashy; A. S. Urusova; V. A. Cherepanov

Phase equilibria, crystal structure and properties of complex oxides in the Nd2O3-SrO-CoO system

T. V. Aksenova ¹ T. G. Efimova ¹ O. I. Lebedev ² Sh. I. Elkalashy ¹ A. S. Urusova ¹ V. A. Cherepanov ¹

1 UrFU - Ural Federal University [Ekaterinburg]

2 CRISMAT - Laboratoire de cristallographie et sciences des matériaux

Abstract : The phase equilibria in the 1/2Nd(2)O(3)-SrO-CoO system were systematically studied at 1373 K in air. The intermediate phases formed in the 1/2Nd(2)O(3)-SrO-CoO system at 1373 K in air are Nd1-xSrxCoO3-delta (0.0 <= x <= 0.5 with orthorhombic structure, sp. gr. Pbnm and 0.6 <= x <= 0.95 whose structure was detected as cubic according to XRD sp. gr. Pm3m, but shown to be tetragonal by TEM due to the oxygen vacancy ordering), Nd2-ySryCoO4-delta (0.6 <= y <= 1.1 with tetragonal K2NiF4-type structure, sp. gr. I4/mmm) and Nd2-zSrzO3 (0.0 <= z <= 0.15 with hexagonal structure, sp. gr. P-3m1). The unit cell parameters for the single phase samples were refined by the Rietveld analysis. The changes of oxygen content in Nd1-xSrxCoO3-delta (0.6 <= x <= 0.95) and Ruddlesden-Popper oxide Nd2-ySryCoO4-delta were examined by TGA. All were found to be oxygen deficient phases. High-temperature dilatometry allows calculating the thermal expansion coefficient and evaluating the chemical expansion coefficient at high temperature. The projection of isothermal-isobaric phase diagram for the Nd-Sr-Co-O system at 1373 K in air to the compositional triangle of metallic components has been constructed. The phase equilibria in the studied Nd-Sr-Co-O system were compared to La-Sr-Co-O and Nd-M-Co-O (M=Ca and Ba).

Keywords : Thermal expansion Oxygen vacancy ordering Oxygen nonstoichiometry Phase equilibria Solid solutions Crystal structure

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Article dans une revue

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Chimie

Chimie / Cristallographie

Chimie / Matériaux

Chimie / Chimie théorique et/ou physique

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https://hal-normandie-univ.archives-ouvertes.fr/hal-02175433
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Soumis le : vendredi 5 juillet 2019 - 17:01:49
Dernière modification le : mercredi 28 août 2019 - 14:31:35

Phase equilibria, crystal structure and properties of complex oxides in the Nd2O3-SrO-CoO system

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Phase equilibria, crystal structure and properties of complex oxides in the Nd2O3-SrO-CoO system

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