Figure 6

XPS spectra for the Cu 2p region for the (a) Na1/2Eu1/2Cu3Ti4O12 and (b) Na1/2Sm1/2Cu3Ti4O12 ceramics prepared at different sintering temperature.
XPS spectra for the Cu 2p region for the (a) Na1/2Eu1/2Cu3Ti4O12 and (b) Na1/2Sm1/2Cu3Ti4O12 ceramics prepared at different sintering temperature.