Phase equilibria and crystal structure of the complex oxides in the Ln-Ba-Co-O (Ln=Nd, Sm) systems

Journal Article · Mon Aug 15 00:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.06.006· OSTI ID:21580200

Gavrilova, L Ya; Aksenova, T V; Volkova, N E; Podzorova, A S ^[1]

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1. Department of Chemistry, Ural State University, Ekaterinburg (Russian Federation)

The phase equilibria in the Ln-Ba-Co-O (Ln=Nd, Sm) systems were systematically studied at 1100 deg. C in air. The homogeneity ranges and crystal structure of the solid solutions: Ln{sub 2-x}Ba{sub x}O{sub 3-{delta}} (0<x{<=}0.1 for Ln=Nd and 0<x{<=}0.3 for Ln=Sm), Nd{sub 3-y}Ba{sub y}Co{sub 2}O{sub 7} (0.70{<=}y{<=}0.80), BaCo{sub 1-z}Sm{sub z}O{sub 3-{delta}} (0.1{<=}z{<=}0.2) were determined by X-ray diffraction of quenched samples. The values of oxygen content (5+{delta}) for slowly cooled LnBaCo{sub 2}O{sub 5+{delta}} (Ln=Nd, Sm) samples were estimated as 5.73 for Ln=Nd, and 5.60 for Ln=Sm. The unit cell parameters were refined using Rietveld full-profile analysis. It was shown that NdBaCo{sub 2}O{sub 5.73} possesses tetragonal structure and SmBaCo{sub 2}O{sub 5.60} - orthorhombic structure. The projections of isothermal-isobaric phase diagrams for the Ln-Ba-Co-O (Ln=Nd, Sm) systems to the compositional triangle of metallic components were presented. - Graphical Abstract: Projections of isobaric isothermal phase diagrams of the Nd-Ba-Co-O system and Sm-Ba-Co-O system. Highlights: > Phase equilibria in the Ln-Ba-Co-O systems (Ln=Nd, Sm). > The homogeneity range for Nd{sub 2-x}Ba{sub x}O{sub 3-{delta}} solid solutions at studied conditions 0<x{<=}0.1. > The homogeneity range for Sm{sub 2-x}Ba{sub x}O{sub 3-{delta}} solid solutions at studied conditions 0<x{<=}0.3. > Nd{sub 3-y}Ba{sub y}Co{sub 2}O{sub 7} solid solutions within the range 0.7{<=}y{<=}0.8. > BaCo{sub 1-z}Sm{sub z}O{sub 3-{delta}} solid solutions within the range 0.1{<=}z{<=}0.2.

• OSTI ID: 21580200
• Journal Information: Journal of Solid State Chemistry, Vol. 184, Issue 8; Other Information: DOI: 10.1016/j.jssc.2011.06.006; PII: S0022-4596(11)00317-3; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN
PHASE DIAGRAMS
SOLID SOLUTIONS
X-RAY DIFFRACTION
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIAGRAMS
DIFFRACTION
DISPERSIONS
ELEMENTS
HOMOGENEOUS MIXTURES
INFORMATION
MIXTURES
NONMETALS
OXYGEN COMPOUNDS
SCATTERING
SOLUTIONS