In:
Journal of Materials Research, Springer Science and Business Media LLC, Vol. 6, No. 5 ( 1991-05), p. 916-927
Abstract:
An alternative synthetic approach was attempted for the fabrication of the Bi–Ca–Sr–Cu oxide superconductor. In this approach a mixed Sr–Ca–Cu oxide powder was first formed, and the resulting powder was subsequently reacted with Bi 2 O 3 . With this reaction scheme, problems associated with the low reactivity of CuO and SrCO 3 can be partially removed by converting the mixed oxide/carbonate precursors to the reactive Sr–Ca–Cu compound. An enhanced rate of formation of the high- T c (110 K) phase was observed in the two-step reaction, and this was explained in terms of the low activation free energy path for the formation of the high- T c phase, which increased the decomposition rate of the remnant CuO. Under the condition of rapid heating, the formation of the high- T c phase in the one-step reaction was expedited by the Cu-rich liquid phase. However, the liquid phase caused the formation of an insulating layer between the superconducting grains in spite of its catalytic activity in the high- T c phase formation.
Type of Medium:
Online Resource
ISSN:
0884-2914
,
2044-5326
DOI:
10.1557/JMR.1991.0916
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
1991
detail.hit.zdb_id:
54876-5
detail.hit.zdb_id:
2015297-8
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