Answers are grounded in this paper and cite their sources.
The preparation and characterization of Bi1.73Pb0.35Sr1.89Ca1.86Cu3O9.91, a lead-rich high-T c phase, were studied (T c(ρ=0)=105 K). This compound crystallized in a pseudotetragonal structure with a t=0.541 nm and c t=3.709 nm, while a unique one-dimensional modulation with a wavelength of 4.7 nm (≃8.7a) was found along the b axis using transmission electron microscopy. Such a lead-rich phase and a lead-free (or very poor) phase crystallizing in the well-known modulated structure (2.7 nm≃5a) were intergrown at intermediate compositions, such as Pb/Bi=1/9. Effects of annealing under different oxygen pressures were studied.
No takes yet. Share an insight, caveat, or question.
Ikeda et al. (1988) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: