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Crystallography, chemistry and structural disorder in the new high-Tc Bi-Ca-Sr-Cu-O superconductorDiffraction experiments are reported which indicate that the new Bi-Ca-Sr-Cu-O layer-structure superconductor possesses a primitive orthorhombic unit cell with probable space group Pnnn. The material exhibits severe structural disorder which is primarily related to stacking within the layers. The apparent orthorhombic structure is an average resulting from orthorhombic material mixed with monoclinic domains in two twinned orientations. Two distinct types of structural disorder that are common in materials synthesized to date are also described. This disorder complicates the crystallographic analysis and suggests that X-ray and neutron diffraction methods may yield only an average structure.
Document ID
19880056622
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Veblen, D. R.
(Johns Hopkins Univ. Baltimore, MD, United States)
Heaney, P. J.
(Johns Hopkins University Baltimore, MD, United States)
Angel, R. J.
(Johns Hopkins Univ. Baltimore, MD, United States)
Finger, L. W.
(Johns Hopkins Univ. Baltimore, MD, United States)
Hazen, R. M.
(Carnegie Institution of Washington Washington, DC, United States)
Date Acquired
August 13, 2013
Publication Date
March 24, 1988
Publication Information
Publication: Nature
Volume: 332
ISSN: 0028-0836
Subject Category
Solid-State Physics
Accession Number
88A43849
Distribution Limits
Public
Copyright
Other

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