XPS study on La0.67Ca0.33Mn1−xCoxO3 compounds

• Electronic structure of La0.67Ca0.33Mn1−xCoxO3 was investigated using XPS.
• Concentration of lattice oxygen relative to the total oxygen decreases with x.
• The Co 2p core level spectra indicate the presence of Co4+ and Co2+ states.
• La 3d, La 4d and O 1s XPS spectra show a shift toward higher BE when x increase.
• VB show features attributed to Mn 3d, Co 3d and hybridized Mn3d(Co3d)-O2p states.

The electronic structure of the polycrystalline La0.67Ca0.33Mn1−xCoxO3 compounds with x = 0.5, 0.6, 0.7, 0.8, 0.9 and 1 has been investigated by X-ray photoelectron spectroscopy (XPS). The valence band and the transition metal core level spectra were analyzed. Several contributions from the Mn 3d, Co 3d and of extensively hybridized Mn3d-O2p and Co3d-O2p states were found in the spectral region between 2 eV and 5 eV. The core level spectra show the presence of Co4+ and Co2+ states.

XPS valence band spectra of La0.67Ca0.33Mn1−xCoxO3 perovskites.Figure optionsDownload as PowerPoint slide