Abstract
ESR investigation of Sr 1 − x Ba x TiO 3 and Sr 1 − x Ca x TiO 3 at x = 0.01, 0.02, 0.04 and 0.06 was carried out in 3 cm frequency region at T = 300 K and T = 77 K. The observed spectra were identified as originating from Mn 4 + , Cr 3 + , Fe 3 + substituted for Ti 4 + . The investigation of the electronic structure was carried out by X-ray spectroscopy (XRS) and X-ray photoelectron spectroscopy (XPS). The valence band (VB) width was shown to be 22–24 eV. It consists of two subbands. The Ti 3d-electrons and oxygen 2p-electrons contribute to the upper VB, while oxygen 2s-electrons contribute to lower VB.