The Study of Electronic Structure and Unavoidable Impurities in Incipient Ferroelectric SrTiO3 Ceramics Doped by Ba or Ca

• Published in: Ferroelectrics Vol. 362; no. 1; pp. 55 - 63
• Main Authors: Glinchuk, M. D., Bykov, I. P., Bondarenko, T. N., Zyrin, A. V., Yurchenko, L. P., Garmash, E. P., Pavlikov, V. N.
• Format: Journal Article
• Language: English
• Published: London Taylor & Francis Group 01-01-2008; Taylor and Francis
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; dielectric constant; Dielectric properties of solids and liquids; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Electron paramagnetic resonance and relaxation; electron spin resonance; Exact sciences and technology; impurity; incipient ferroelectrics; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Permittivity (dielectric function); Perovskite; Physics; incipient ferroelectrics; Valence bands; impurity; Calcium additions; Doping; Subband; dielectric constant; electron spin resonance; Perovskite; Electronic structure; Impurities; Barium additions; Bandwidth; Strontium titanates; Electron paramagnetic resonance; Permittivity; X-ray photoelectron spectra
• ISSN: 0015-0193; 1563-5112
• DOI: 10.1080/00150190802001146

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.