by R. Gago, S. Prucnal, R. Pérez-Casero, I. Caretti, I. Jiménez, F. Lungwitz and S. Cornelius
Abstract:
We address the impact of chromium (Cr) incorporation (textless15 at.%) in the structure of titanium dioxide (TiO2:Cr) films for as-grown and after flash-lamp-annealing (FLA) states. Samples were produced by DC magnetron sputtering on either unheated or heated (400 °C) substrates. Complementary medium- and local-order information was extracted by X-ray diffraction and absorption near-edge structure, respectively. TiO2:Cr grown on unheated substrates are amorphous with the major contribution from Cr3+ and progressive formation of Cr6+ with Cr. On heated substrates, anatase phase is dominant for low Cr levels (≤7 at.%) and the structure evolves with Cr towards a disordered mixed-oxide with rutile structure. By tuning the FLA energy density, customized (single or mixed) phase formation is achieved from (initially amorphous) Cr-free TiO2. For amorphous TiO2:Cr with low Cr (≤7 at.%), FLA induces a short-range rutile structure but structural ordering is not observed at higher Cr levels. Nonetheless, FLA annihilates Cr6+ sites and promotes Cr4+, which is associated to the mixed-oxide rutile. FLA also improves the pristine structure of anatase TiO2:Cr grown on heated substrates. These results provide relevant information about the atomic structure of mixed oxides and the use of FLA for the synthesis of band-gap engineered TiO2-based materials.
Reference:
R. Gago, S. Prucnal, R. Pérez-Casero, I. Caretti, I. Jiménez, F. Lungwitz and S. Cornelius, “Structural impact of chromium incorporation in as-grown and flash-lamp-annealed sputter deposited titanium oxide films”, Journal of Alloys and Compounds, vol. 729, pp. 438–445.
Bibtex Entry:
@article{gago_structural_2017,
title = {Structural impact of chromium incorporation in as-grown and flash-lamp-annealed sputter deposited titanium oxide films},
volume = {729},
issn = {0925-8388},
url = {http://www.sciencedirect.com/science/article/pii/S0925838817332346},
doi = {10.1016/j.jallcom.2017.09.184},
abstract = {We address the impact of chromium (Cr) incorporation ({textless}15 at.%) in the structure of titanium dioxide (TiO2:Cr) films for as-grown and after flash-lamp-annealing (FLA) states. Samples were produced by DC magnetron sputtering on either unheated or heated (400 °C) substrates. Complementary medium- and local-order information was extracted by X-ray diffraction and absorption near-edge structure, respectively. TiO2:Cr grown on unheated substrates are amorphous with the major contribution from Cr3+ and progressive formation of Cr6+ with Cr. On heated substrates, anatase phase is dominant for low Cr levels (≤7 at.%) and the structure evolves with Cr towards a disordered mixed-oxide with rutile structure. By tuning the FLA energy density, customized (single or mixed) phase formation is achieved from (initially amorphous) Cr-free TiO2. For amorphous TiO2:Cr with low Cr (≤7 at.%), FLA induces a short-range rutile structure but structural ordering is not observed at higher Cr levels. Nonetheless, FLA annihilates Cr6+ sites and promotes Cr4+, which is associated to the mixed-oxide rutile. FLA also improves the pristine structure of anatase TiO2:Cr grown on heated substrates. These results provide relevant information about the atomic structure of mixed oxides and the use of FLA for the synthesis of band-gap engineered TiO2-based materials.},
urldate = {2019-10-01},
journal = {Journal of Alloys and Compounds},
author = {Gago, R. and Prucnal, S. and Pérez-Casero, R. and Caretti, I. and Jiménez, I. and Lungwitz, F. and Cornelius, S.},
month = dec,
year = {2017},
keywords = {XANES, Atomic scale structure, Oxide materials, Vapour deposition},
pages = {438--445},
file = {ScienceDirect Full Text PDF:E:\Usuarios\Administrator\Zotero\storage\W3XWZC4S\Gago et al. - 2017 - Structural impact of chromium incorporation in as-.pdf:application/pdf;ScienceDirect Snapshot:E:\Usuarios\Administrator\Zotero\storage\BBLCXAI8\S0925838817332346.html:text/html},
}