Kinetic study of the formation of Bi1.8Pb0.2Sr2Ca2Cu3 Ox ceramic superconductor

Anna Tampieri, E. Landi, A. Bellosi

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

The compound under investigation was prepared with the nominal composition Bi1.8Pb0.2Sr2Ca2Cu3 Ox through solid-state reaction starting from Bi2O3, PbO, SrCO3, CaCO3 and CuO powders. Reactions among components were investigated by thermogravimetric and differential thermal analysis in the temperature range 700-850 °C. Reaction kinetics for the solid-state synthesis of Bi1.8Pb0.2Sr2Ca2Cu3 Ox (compound A) were evaluated according to the mathematical relationships derived theoretically for phenomenological models and were compared with those for a Bi1.8Pb0.2Sr2Cu3Ox mixture (compound B), in order to formulate a correlation among the starting nominal compositions, the kinetic results and a phenomenological model for the solid-state reaction. A second-order classical model provides a reaction kinetics suitable for describing the process at temperatures lower than 770 °C for system A and at temperatures lower than ≈815 °C for system B. At higher temperatures a three-dimensional diffusion model fits the data for both systems. Crystalline phases and microstructural features of samples derived from the thermal treatments were analyzed.

Original languageEnglish (US)
Pages (from-to)157-161
Number of pages5
JournalMaterials Chemistry and Physics
Volume34
Issue number2
DOIs
StatePublished - Jan 1 1993

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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