To elucidate the effect of Pb substitution on the modulation structure of the Bi2212 phase, we prepared Pb-free Bi2Sr1.8(Ca1-xYx)Cu2Oy and Pb-substituted Bi1.6Pb0.4Sr1.8(Ca1-xYx)Cu2Oy. For both the Pb-free and Pb-substituted Bi-2212 phases, the modulation wave number σ increased with increasing oxygen content y. This tendency is explained by the excess oxygen that is inserted into the BiO layer and leads to the formation of the modulation structure. For the Pb-free Bi2212 phase, σ increased with increasing O-Cu-O length l. This tendency is explained by the lattice mismatch that exists between the O-Bi-O and O-Cu-O layers. In contrast, for the Pb-substituted Bi2212 phase, σ changed only slightly with increasing l, revealing that the relaxation mechanism for lattice mismatch in the Pb-substituted Bi2212 phase is different from that of the Pb-free Bi2212 phase. A possible mechanism for relaxation of lattice mismatch is the change in Pb valence. As the Pb valence increases from 2+ to 4+, the ionic radius of Pb decreases, suggesting that l decreases and the mismatch between the O-Cu-O and Bi(Pb)O lengths decreases.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.