Abstract
Monodimensional diffusion measurements have been used to characterise the solid state reactivity in the Ca, Sr, Cu, Bi/O system at 750°C under pure oxygen flux (1 atm). The investigated couples are: (1) Bi 2O 3-CaCO 3; (2) CaCO 3-CuO; (3) CaCO 3-SrCO 3; (4) Sr 2Bi 2O 5-CaCO 3; (5) CaBi 2O 4-SrCO 3; (6) CaBi 2O 4-CuO; (7) CaBi 2O 4-CaCO 3; (8) CaBi 2O 4-SrCuO 2. The paper reports the phase nature and composition of the solid products formed by the various couples, as well as their rates of formation. In most cases, reaction mechanisms and rate-controlling species have been determined. The paper discusses the problem of finding a clean solid state path towards a pure “2212” phase, i.e. a suitable sequence of solid state reactions such that each reaction gives a single phase product. The results show that a reaction path of this kind is not available under the selected external conditions (750°C, pure oxygen environment at 1 atm, carbonate precursors, and 2:2:1:2 Bi:Sr:Ca:Cu ratio).
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