Original paper
XPS investigation of titanium in melanites from Monte Vulture (Italy)
Malitesta, Cosimino; Losito, Ilario; Scordari, Fernando; Schingaro, Emanuela
European Journal of Mineralogy Volume 7 Number 4 (1995), p. 847 - 858
32 references
published: Jul 26, 1995
manuscript accepted: Mar 8, 1995
manuscript received: Feb 6, 1995
DOI: 10.1127/ejm/7/4/0847
Abstract
Abstract X-ray photoelectron spectroscopy (XPS) is used in the present study to investigate the oxidation state and the structural role of titanium in two melanites with different TiO2 content (~ 3 % and ~ 6 % wt) from M.Vulture (Italy). The Ti2p-XPS spectra can be satisfactorily fitted when Ti3+ is lodged on octahedral and Ti4+ distributed over octahedral and tetrahedral sites. The XPS direct estimates of Ti site populations match very well with those indirectly obtained from Mössbauer spectroscopy (MS) through the Fe distribution. In addition, good agreement between the Fe2+/Fe3+ ratios estimated by both XPS and MS has been found using Fe3O4 as a standard for interpreting Fe2p photoelectron spectra