Electronic structure of strontium titanate

Abstract

We have employed the techniques of photoelectron spectroscopy {with tunable synchrotron radiation 30& h v& 100 eV) and inverse photoemission spectroscopy at h v=9.7 eV to study respectively the occupied and unoccupied electronic states of n-type SrTi03 doped with 1 at. /o Nb. Doped samples have the advantage that charging effects are avoided and hence a rather accurate determination of peak positions is possible. The total (occupied and empty) experimental density of states agrees with the calculated density of states of Pertosa and Michel-Calendini when their band-gap energy is readjusted. %'e have no evidence for intrinsic surface states either in the band gap or in the conduction band, as was calculated by Wolfram et al. The admixture of Ti 3d states in the 0 2p valence states is small, as can be concluded from the Ti 3p~3 d resonance behavior.

Coherent and Incoherent Excitations of Electron-DopedSrTiO3

“…3(c). Note that, if the ∼1.5-eV state was due to surface states, the intensity should scale, with decreasing bulk sensitivity (with increasing θ), to that of the 11-eV peak which originates from surface adsorbates [27]. This is clearly not the case as seen in Fig.…”

Synthesis, characterization and photocatalytic activity of nano sized undoped and Ga doped SrTi0.7Fe0.3O3 for 2,4,6-trichlorophenol photodegradation

“…Several methods are used for the removal of chlorophenols from the aqueous solutions such as adsorption, biodegradation, and advanced oxidation process [2]. SrTiO 3 (ST) is one of the important high band gap photoctalysts (band gap = 3.2 eV) [15]. It requires UV light to generate the photocatalytic activity.…”

Nanometer-Scale Striped Surface Terminations on Fractured SrTiO3 Surfaces

“…Previously reported theoretical calculations of the LDOS for d-band electrons have shown that the TiO 2 empty states occur at a lower energy than the SrO states 27,28 . Therefore, our assignment of the two different domains is consistent with these results.…”