In:
Journal of Materials Research, Springer Science and Business Media LLC, Vol. 6, No. 5 ( 1991-05), p. 891-894
Abstract:
Nitrogen dioxide was used to oxidize nonsuperconducting, powdered YBa 2 Cu 3 O 6.0 to form a material that exhibits the Meissner effect at liquid nitrogen temperature. Nitrogen dioxide treatment at 200 °C for 70 h results in a mixed-phase material containing superconducting YBa 2 Cu 3 O 6.9 that exhibits onset of superconductivity at 91.5 K and a midpoint at 88 K. During a 70-h exposure of YBa 2 Cu 3 O 6 to NO 2 at 200 °C, a mixture of oxidation and degradation products is formed, including YBa 2 Cu 3 O 6.9 (61% by weight) and Ba(NO 3 ) 2 (23% by weight). Heating the NO 2 -treated product to 900 °C results in the evolution of NO, NO 2 , and O 2 ; cooling the sample and annealing at 400 °C in an O 2 stream generates the superconducting oxide.
Type of Medium:
Online Resource
ISSN:
0884-2914
,
2044-5326
DOI:
10.1557/JMR.1991.0891
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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