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DTA(solid lines)-TGA(dashed lines) results and their heating cycle of the : (a) heated up to with , (b) Cu oxidation, (c) partial melting in Ar gas, and (d) phase formation in gas.
SEM images of the specimens melted for (a) and (b) and EDS spectra at in Ar gas.
XRD results of the specimens heat treated for (a) , (b) , and (c) at in Ar gas [1: 2212, 2: 2201, 3: , 4: alkaline earth cuprate (AEC 2:1)].
Surface and cross section images and EDS spectra at the point marked as “1” in the interface layer of the specimens heat treated for (a) and [(b) and (c)] at in gas after the partial melting.
XRD results of the specimens (a) heat treated for at in gas and (b) ground by after the heat treatment for .
Resistance vs temperature plot in the specimens heat treated for (a) , (b) , and (c) at in gas.
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