Effects of Bi(x) additives on microstructure and superconductivity in YBa2−xBixCu3O7−δ

Shanker Ram; K. A. Narayan

doi:10.1103/PhysRevB.42.8627

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Effects of Bi(x) additives on microstructure and superconductivity in YBa2−xBixCu3O7−δ

Shanker Ram, K. A. Narayan

DOI 10.1103/PhysRevB.42.8627 · Physical Review B

T1

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Abstract

New compositions of the high-Tc superconductor YBa2−xBixCu3O7−δ, with x≤0.5, have been prepared by the usual ceramic process. The presence of bismuth (x<0.3) in these compositions activates crystallization of the superconductor phase (which gives an improved Tc∼97 K), processed at 930 °C/12 h in an O2 atmosphere. The crystallites exhibit very small sizes and sharp distribution.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2-xBixCu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	97	Pressure not reported	midpoint
YBa2-xBixCu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	94	Pressure not reported	zero_resistance
YBa2-xBixCu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	100	Pressure not reported	onset
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91	Pressure not reported	midpoint
Bi2Sr3-xCaxCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown