Electron microscopy study of Pb-substitution in bulk Bi–Sr–Ca–Cu–O superconductors

Autor:	D. Werder, C. H. Chen, R. C. Sherwood, Sungho Jin
Rok vydání:	1989
Předmět:	Diffraction Superconductivity Materials science Scattering Mechanical Engineering Superlattice Mineralogy Crystal structure Condensed Matter Physics Crystallographic defect Crystallography Electron diffraction Mechanics of Materials Lattice (order) General Materials Science
Zdroj:	Journal of Materials Research. 4:748-751
ISSN:	2044-5326 0884-2914
DOI:	10.1557/jmr.1989.0748
Popis:	We present the results of an electron microscopy study of Pb-substitution in bulk Bi–Sr–Ca–Cu–O superconductors. We observe grains with c-axis lattice parameters of 30.8 Å (2212 phase), 36.7 Å (2223 phase), and 43.2 Å (2234 phase) containing no intergrowth defects. The existence of two separate incommensurate superstructures, Q1 and Q2, which were previously observed in Pb-doped ceramics and single crystals, has been confirmed in this study. It is found that superlattice reflections from the Q2,-modulated structure in the 2223 phase are much weaker than those from the Q2-modulation, whereas the diffraction intensities of the Q1- and Q2-modulations in the 2212 phase are similar. We also show that the periodicity along the b-axis of the Q2-modulation increases with increasing Pb-substitution, contrary to the implications of a previously suggested structural model.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e67fd2a76e28775fa31986b1de686024 https://doi.org/10.1557/jmr.1989.0748 Zobrazit plný text záznamu Full text from SpringerLink