TY - JOUR
T1 - Kinetic study of the formation of Bi1.8Pb0.2Sr2Ca2Cu3 Ox ceramic superconductor
AU - Tampieri, Anna
AU - Landi, E.
AU - Bellosi, A.
PY - 1993/1/1
Y1 - 1993/1/1
N2 - 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.
AB - 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.
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U2 - 10.1016/0254-0584(93)90206-2
DO - 10.1016/0254-0584(93)90206-2
M3 - Article
AN - SCOPUS:0027595435
SN - 0254-0584
VL - 34
SP - 157
EP - 161
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
IS - 2
ER -