Abstract
Attempts to substitute Bi for Nd in orthorhombic NdBa2Cu3O y , prepared in air or oxygen at about 950°C led instead to formation of Ba2NdBiO6, a new cubic compound witha=0.8703 nm. The possibility was then explored of preparing superconducting (Nd1−x Bi x )Ba2Cu3O y , 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 NdBa2Cu3O y , 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.
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Suchow, L., Tang, J. Investigations of Bi substitution in NdBa2Cu3Oy . J Supercond 4, 289–296 (1991). https://doi.org/10.1007/BF00618151
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DOI: https://doi.org/10.1007/BF00618151