In:
Journal of Materials Research, Springer Science and Business Media LLC, Vol. 8, No. 3 ( 1993-03), p. 415-420
Abstract:
A compound with the stoichiometry of Y 1 Ba 4 Cu 2 CO 3 O 5.5±δ is formed in the presence of CO 2 or carbonate. Analysis techniques including oxygen overpressure, wet chemical analysis, and quenching experiments establish that this material is an oxycarbonate compound. Electrical measurements indicated no superconductive properties in the 10–298 K temperature range. The ease of formation of this compound causes it to commonly appear in synthesis in this region of the phase diagram and accounts for many of the conflicting reports of properties and solid solution formation. XRD shows evidence for the existence of some solid solution in this oxycarbonate. The compound Y 1 Ba 4 Cu 3 O 8.5±δ , formed in the absence of CO 2 , and Y 1 Ba 4 Cu 2 CO 3 O 5.5±δ , formed in the presence of CO 2 , are the only barium-rich phases seen to exist.
Type of Medium:
Online Resource
ISSN:
0884-2914
,
2044-5326
DOI:
10.1557/JMR.1993.0415
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
1993
detail.hit.zdb_id:
54876-5
detail.hit.zdb_id:
2015297-8
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