Equilibrium conductivity of YBa2Cu2Ox

Defects in Inorganic Compounds

“…Comparison of the conditions at the minima with published equilibrium compositional data (11) indicates that the composition at the minima is Y B a^u^. Comparison of the conditions at the minima with published equilibrium compositional data (11) indicates that the composition at the minima is Y B a^u^.…”

Nonstoichiometry in oxides and its control

“…The n to p semiconducting transition occurring at this point is manifested, among other, by a switch in the thermopower sign and occurring minimum in oxygen diffusivity. Of the two integer structures, only the combination of the mono-and divalent copper in YBa 2 Cu 3 O 6 fulfils these criteria [18,19]. Unfortunately, the experimental data are limited by the phase-stability boundary coinciding with this composition.…”

Phase diagrams for the YBa2Cu3O7 family — ANNO 1996

“…This situation also corresponds to a minimum in the oxygen ion diffusivity [546]. Based on both these criteria, the stoichiometric situation occurs at the composition YBa2Cu306, i.e., having Cu(I) with its typical linear coordination at the Cu(1) site and Cu(II) at the two square-pyramidal Cu(2) sites [547,539]. Unfortunately, the phase stability boundary coincides with this composition, and this somewhat complicates measurements at low defect-concentrations in YBa2Cu306+w, where otherwise a more ideal behaviour would be expected.…”