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

✍ Scribed by L.Ya. Gavrilova; T.V. Aksenova; N.E. Volkova; A.S. Podzorova; V.A. Cherepanov

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
469 KB
Volume
184
Category
Article
ISSN
0022-4596

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✦ Synopsis

The phase equilibria in the Ln-Ba-Co-O (Ln ¼Nd, Sm) systems were systematically studied at 1100 1C in air. The homogeneity ranges and crystal structure of the solid solutions:

  1. were determined by X-ray diffraction of quenched samples. The values of oxygen content (5 þ d) for slowly cooled LnBaCo 2 O 5 þ d (Ln ¼ Nd, Sm) samples were estimated as 5.73 for Ln ¼ Nd, and 5.60 for Ln ¼ Sm. The unit cell parameters were refined using Rietveld full-profile analysis. It was shown that NdBaCo 2 O 5.73 possesses tetragonal structure and SmBaCo 2 O 5.60 -orthorhombic structure. The projections of isothermal-isobaric phase diagrams for the Ln-Ba-Co-O (Ln ¼Nd, Sm) systems to the compositional triangle of metallic components were presented.

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