Silver has played a critical role in the fabrication of metal/ high-T, superconductor composites. Phase equilibrium in the binary PbO-Ag and CuO-Ag systems has been investigated using differential thermal analysis (DTA), thermogravimetry (TG), and X-ray diffractometry (XRD) techniques. Composition versus temperature diagrams have been established for these systems in air. Eutectic reactions CuO + Ag = L at a composition of Ag = 98.6 mol% and 932" & 3°C for the CuO-Ag system and PbO + Ag = L at a composition of Ag = 8.3 mol% and 825" k 3°C for the PbO-Ag system have been detected. The CuO-Ag system has two immiscible liquid phases in the composition regime of Ag = 30.6-98 mol% , and there are two immiscible liquid phases at the composition range of Ag = 11.7-95.7 mol% in the PbO-Ag system.
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