Investigations of Bi substitution in NdBa2Cu3Oy

Document Type

Article

Publication Date

8-1-1991

Abstract

Attempts to substitute Bi for Nd in orthorhombic NdBa2Cu3Oy, prepared in air or oxygen at about 950°C led instead to formation of Ba2NdBiO6, a new cubic compound with a=0.8703 nm. The possibility was then explored of preparing superconducting (Nd1-xBix)Ba2Cu3Oy, by first forming the tetragonal phase at 880-950°C in nitrogen or argon followed by reheating in oxygen or air at 250-500°C in order to insert the additional oxygen required to yield the orthorhombic form while avoiding oxidation of Bi3+ to Bi5+. X-ray diffraction studies, electrical conductivity measurements, and thermogravimetric analysis of products indicate that Bi does not enter the NdBa2Cu3Oy, lattice in either the tetragonal or the orthorhombic phase. Ba2NdBiO6 clearly forms on reheating in oxygen or air even at low temperatures, and evidence is presented that a poorly crystallized oxygen-deficient form of this compound is already present prior to the reheating. © 1991 Plenum Publishing Corporation.

Identifier

0026206173 (Scopus)

Publication Title

Journal of Superconductivity

External Full Text Location

https://doi.org/10.1007/BF00618151

e-ISSN

15729605

ISSN

08961107

First Page

289

Last Page

296

Issue

4

Volume

4

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