Phase equilibria in the Ag-CuO-Cu2O system were experimentally determined
using thermal analysis, and structural and compositional studies. Three
reactions were observed in air:
(1) L1 = CuO + Ag,
(2) L2 = CuO + L1,
and (3) Cu2O = CuO + L2.
The evolution and absorption of oxygen accompanied these reactions. At oxygen
partial pressures below 0.02 bar, the reactions L1 = Cu2O + Ag and L2 = Cu2O + L1 were
found. Based on isobaric projections in the Ag-CuO-Cu2O system, two
invariant reactions, L1 = CuO + Cu2O + Ag and L2 = CuO + Cu2O + L1, were deduced.