2p X-ray absorption of titanium in minerals

Abstract

Abstract. Ti 2p X-ray absorption spectra for a series of minerals have been measured. Crystal field multiplet calculations can explain the spectral shape. The asymmetry of the e. peak is shown to be related to distortions of the Ti Ir octahedron. It is found, theoretically as well as experimentally, that the absorption spectra are more sensitive to tetragonal distortions than to trigonal distortions. A number of silicate minerals and metamict minerals containing titanium are measured and Ti HI has not been observed in any of these minerals. A comparison is made to the 1 s X-ray absorption, and the potential of both for the study of minerals is discussed.

The formation of Ti–O tetrahedra and band gap reduction in SiO2 via pulsed ion implantation

“…A look at the vastly different multiplet structure of a d 1 Ti 3þ ion confirms this. 24 Transition metal L 2;3 XAS spectra of oxides and related materials are generally well understood 23,25 and are well described by MCFT. For the Ti 4þ cases shown here, the spectra can be roughly divided into two slightly overlapping (and interfering) regions which are split apart by the 2p spin orbit coupling: the L 3 region below $461 eV and the L 2 region above this point.…”

Magnetic structures of FeTiO3-Fe2O3 solid solution thin films studied by soft X-ray magnetic circular dichroism and ab initio multiplet calculations

“…This kind of spectrum has been interpreted to be Ti 4þ in oxygen octahedron. 33,34 Surprisingly, however, there exists undeniable XMCD signal as seen from Figs. 3(c) and 3(d).…”

Characteristics of CoxTi1−xO2 thin films deposited by metal organic chemical vapor deposition

“…The largest differences between the Ti 2p XAS spectra of anatase and rutile can be seen in the L 3 -edge e g region. This splitting and asymmetry of the e g peak is related to the lowering of crystal field symmetry from octahedral (O h ) to D 2d and D 2h [14]. For the anatase structure (D 2d ), the spectral weight is shifted to the lower energy peak (left most peak of the doublet), whereas for the rutile structure (D 2h ) the spectral weight of the doublet is more in the higher energy peak (right most peak).…”

“…Auger decay processes [13,14]. The lowering of symmetry from spherical to octahedral introduces a crystal field responsible for the splitting of each edge into lower energy, more easily accessible, p -bonded t 2g antibonding states and higher energy s-bonded e g antibonding states.…”