Abstract
Thermogravimetric (TG) measurements and differential thermoanalysis (DTA) were carried out connected with X-ray powder diffraction investigations of Ba 2Cu 3O 5+ d samples prepared at different temperatures. A low temperature tetragonal phase with higher oxygen content and a high temperature tetragonal phase could be distinguished with lattice constants a = 16.19 Å and 12.96 Å, and c = 12.38 Å and 9.16 Å, respectively. A possible mechanism for selective preparation of superconductors from high temperature phase has also been proposed assuming a structure with space group P4 2/mcm.
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