In situ disordering of monoclinic titanium monoxide Ti5O5 studied by transmission electron microscope TEM

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Institutes & Expert groups

  • Institute of Solid State Chemistry - Ural Branch of the Russian Academy of Sciences

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Abstract

The superlattice and domain structures exhibited by ordered titanium monoxide Ti5O5 are disrupted by low energy electron beam irradiation. The effect is attributed to the disordering of the oxygen and titanium sublattices. This disordering is caused by the displacement of both oxygen and titanium atoms by the incident electrons and results in a phase transformation of the monoclinic phase Ti5O5 into cubic B1 titanium monoxide. In order to determine the energies required for the displacement of titanium or oxygen atoms, i.e. threshold displacement energies, a systematic study of the disappearance of superstructure reflections with increasing electron energy and electron bombardment dose has been performed in situ in a transmission electron microscope (TEM). An incident electron energy threshold between 120 and 140 keV has been observed. This threshold can be ascribed to the displacements of titanium atoms with 4 as well as with 5 oxygen atoms as nearest neighbors. The displacement threshold energy of titanium atoms in Ti5O5 corresponding with the observed incident electron threshold energy lies between 6.0 and 7.5 eV. This surprisingly low value can be explained by the presence of either one or two vacant oxygen lattice sites in the nearest neighbors of all titanium atoms.

Details

Original languageEnglish
Article number10769
JournalScientific Reports
Volume7
DOIs
Publication statusPublished - 7 Sep 2017

Keywords

  • Transmission electron microscopy, Ti5O5, Ordering

ASJC Scopus subject areas

ID: 3029333