Preparation of superconducting YBa2Cu3O7 from the corresponding metal formates

Rm. Panayappan; Joseph T. Guy, Jr.; Robert Binstead; Valerie LeToyrneau; John C. Cooper

doi:10.1103/PhysRevB.37.3727

← Back to search

Preparation of superconducting YBa2Cu3O7 from the corresponding metal formates

Rm. Panayappan, Joseph T. Guy, Jr., Robert Binstead, Valerie LeToyrneau, John C. Cooper

DOI 10.1103/PhysRevB.37.3727 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

Superconductive YBa2Cu3O7 was prepared from a mixture of yttrium, barium, and copper (II) formates in flowing oxygen. The product was obtained by single-cycle heating to 920 °C. Unlike conventional preparations, the orthorhombic phase is obtained without the requirement of an extended annealing period. Magnetic susceptibility measurements show the onset of superconductivity occurs at 95 K with a magnetic-flux expulsion of 5% at lower temperatures. X-ray powder diffraction data show the material to be predominantly the orthorhombic phase, with excess BaO impurity and none of the tetragonal phase present.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	95	Pressure not reported	onset