Abstract
The phase relations have been studied in the BaO-CuOx system in the range of 25.0–45.0 mol % CuO at P(O2) = 21 kPa by visual polythermal analysis (VPA), X-ray phase analysis (XPA), differential thermal analysis (DTA), thermogravimetric analysis (TGA), chemical analysis (CA), X-ray microprobe analysis (XMEA), and electron diffraction (ED), with simultaneous elemental analysis (EA) by a transmission electron microscope (TEM). A discrete deviation of the 2.10, 2.08, 2.04, 2.02 (Ba/Cu) compositions from stoichiometry in the known Ba2CuO3 + δ oxides is found. New oxides of the 2.00, l.75, 1.66, 1.15 (Ba/Cu) compositions are revealed and their unit-cell parameters are determined. The phase diagram of the BaO-CuOx system is constructed, whose structure is considered as the total projection of phase states of the system at T = f(x) in CuOx.
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