Effect of Synthesis Route on the Structure of Nd3 - XBa3+xCu6O14-2δ (x = 0, 1) System: A Neutron Diffraction Study

Abstract

Structural studies on Nd3-xBa3+xCu6O14-2δ with 0 ≤ x ≤ 1 were carried out by Rietveld refinement procedure using neutron diffraction data. The composition x = 1 was prepared both by the solid-state method and the nitrate-decomposition method. Quantitative multiphase analysis coupled with variation in the method of synthesis has shown conclusively that Nd did substitute for Ba even in a stoichiometric composition NdBa2Cu3O7-δ, irrespective of the method of synthesis. The fractional atomic substitution of Nd at the Ba site has been determined to be about 15%. The composition x = 0, synthesised by the nitrate-decomposition method, has been found to be tetragonal with the space group P4/mmm. Nd has been found to substitute for Ba according to Nd(Ba0.75Nd0.25)2Cu3O7-δ and no random distribution of cations has been found along the c-direction. The observed tetragonality has been attributed to the additional oxygen taken into the basal (001) plane due to the substitution of trivalent Nd at the divalent Ba site. © 2002 Elsevier Science Ltd. All rights reserved.

Department(s)

Physics

Keywords and Phrases

A. High-T superconductors c; C. Crystal structure and symmetry; D. Phase transitions; E. Neutron scattering

International Standard Serial Number (ISSN)

0038-1098

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Elsevier, All rights reserved.

Publication Date

01 Apr 2002

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