CO2 decomposition kinetics of YBa2Cu3O7-x via in situ electrical conductivity measurements

E. A. Cooper, A. K. Gangopadhyay, T. O. Mason, U. Balachandran

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In situ electrical conductivity measurements were employed to study the kinetics of decomposition of YBa2Cu3O7-x in flowing 5% CO2/95% O2 atmosphere at 815°C. Three regimes could be observed in the decay of the conductivity with time, interpreted as corresponding to nucleation over the initial 5-10 min, rapid formation of Y2Cu2O5, BaCO3, and CuO between 10 min and 1 h, and finally transition to the formation of Y2BaCuO5, BaCO3, and CuO at longer times. The absence of dispersion in impedance measurements as a function of frequency together with the gradual decay of conductivity (roughly corresponding to the remaining volume fraction of YBa2Cu3O7-x) indicates that not all grain boundaries are involved in the decomposition process.

Original languageEnglish
Pages (from-to)1393-1397
Number of pages5
JournalJournal of Materials Research
Issue number7
Publication statusPublished - Jul 1991

ASJC Scopus subject areas

  • Materials Science(all)

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