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Low-temperature oxidation of YBa2Cu3O6.0 with nitrogen dioxide

Published online by Cambridge University Press:  31 January 2011

Stephen A. Montzka ,
Brooks M. Hybertson ,
Robert M. Barkley  and
Robert E. Sievers
Stephen A. Montzka
Affiliation:
Department of Chemistry and Biochemistry, and Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado 80309–0215
Brooks M. Hybertson
Affiliation:
Department of Chemistry and Biochemistry, and Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado 80309–0215
Robert M. Barkley
Affiliation:
Department of Chemistry and Biochemistry, and Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado 80309–0215
Robert E. Sievers*
Affiliation:
Department of Chemistry and Biochemistry, and Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado 80309–0215
*
a)Address correspondence to this author; phone (303) 492–7943, fax (303) 492–1149.
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Abstract

Nitrogen dioxide was used to oxidize nonsuperconducting, powdered YBa2Cu3O6.0 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 YBa2Cu3O6.9 that exhibits onset of superconductivity at 91.5 K and a midpoint at 88 K. During a 70-h exposure of YBa2Cu3O6 to NO2 at 200 °C, a mixture of oxidation and degradation products is formed, including YBa2Cu3O6.9 (61% by weight) and Ba(NO3)2 (23% by weight). Heating the NO2-treated product to 900 °C results in the evolution of NO, NO2, and O2; cooling the sample and annealing at 400 °C in an O2 stream generates the superconducting oxide.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 5 , May 1991 , pp. 891 - 894
Copyright
Copyright © Materials Research Society 1991

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