NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Growth and characterization of large YBa2Cu3O(7-x) single crystalsCentimeter-sized crystal plates of YBa2Cu3O(7-x) have been obtained using a bulk composition and method described by Schneemeyer at al. (1987) modified for growth in a pure oxygen atmosphere. A porous MgO crucible and long soak time promote large crystals. Mg was not detectable in the crystals. Electron microbeam analysis using a 60 A monochromator crystal for the oxygen determination gave the composition Y(1.05)Ba(2.02)Cu(2.94)O(6.52 + or - 0.06). As-grown crystals from the melt surface exhibit a fairly sharp Tc with zero resistance at 80 K, and show complex twinning and crack patterns. Optical micrographs of a lightly polished surface normal to the c-axis of a 3-mm crystal delineate twinning and fine scale microcracking; this crystal surface now has a zero resistance at 68 K. Microhardness measurements and microfracture observations indicate intrinsic properties that may inhibit or impede large scale manufacture of electronic ceramics.
Document ID
19890026086
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Keester, Kenneth L.
(California Institute of Technology Pasadena, United States)
Housley, Robert M.
(California Inst. of Tech. Pasadena, CA, United States)
Marshall, David B.
(Rockwell International Science Center Thousand Oaks, CA, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1988
Publication Information
Publication: Journal of Crystal Growth
Volume: 91
Issue: 3, Au
ISSN: 0022-0248
Subject Category
Solid-State Physics
Accession Number
89A13457
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available