Zinc saturation in YBa2Cu3O7-δ

doi:10.1016/0921-4534(94)91382-X

Physica C: Superconductivity

Volumes 235–240, Part 1, December 1994, Pages 317-318

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Abstract

Saturation in YBa₂(Cu_1−xZn_x)₃O_7-δ has been studied in relation to phase composition. Nominal compositio up to x=0.3 have been synthesized by an optimized 3 steps solid state route. Values as high as x=0.12 were observed at nominal zinc content where secondary phases appear (x≥0.1). Mixtures of pure YBa₂Cu₃O_7−δ with ZnO were also sintered. In this case, x is never higher than 0.07. Rietveld refinement applied to X-ray diffraction datas shows that the orthorhombic character of the YBa₂Cu₃O_7-δ lattice is maintained in the range 0≤x≤0.12. Correlations between zinc saturation and Y₂O₃BaCO₃CuO phase diagram are established.

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Cited by (1)

Iron doping effect on composition and microstructure of Bi<inf>2·05</inf>Sr<inf>1·9</inf>Ca<inf>1·05</inf> (Cu<inf>1-x</inf>Fe<inf>x</inf>)<inf>2</inf>O<inf>8+ δ</inf>(0≤x≤0·15) superconductors
1999, Journal of the European Ceramic Society
Samples with Bi_2·05Sr_1·9Ca_1·05(Cu_1-xFe_x)₂O_8+δ(0≤x≤0·15) compositions were synthesized by a liquid-mix process able to give single phase compounds. The superconducting phase was carefully investigated by SEM and EDX. Substitution of x Fe atoms in the Bi₂Sr₂CaCu₂O_8+δ grains corresponds to the removal of 1·7x Cu atoms and to the addition of 0·75x Bi atoms whereas the sum Sr+Ca remains quite constant. In a first step, this evolution may be explained by the following basic model: Fe₂O₃→2Fe_cu^•+V_cu″+3 CuO which assumes the creation of vacancies in the copper sites of the Bi₂Sr₂CaCu₂O_8+δ lattice. However, the apparent increase of Bi content suggests the formation of microdomains of Bi₂Sr₂CuO₆ phase intergrown in the Bi_2·05Sr_1·9Ca_1·05(Cu_1-xFe_x)₂O_8+δ grains, as inferred from X-ray diffraction and SEM which reveals the concomitant (SrCa)₁₄Cu₂₄O₄₁ secondary phase. The EDX results are more consistent with a Bi₂Sr₂CuO₆–Bi₂Sr₂CaCu₂O_8+δ intergrowth model in which Fe is accommodated in the Bi₂Sr₂CuO₆ microdomains than with the model of substitution in a Bi₂Sr₂CaCu₂O_8+δ single phase.

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