XANES and EXAFS study of titanium alkoxides

Babonneau, Florence; Dœuff, S.; Léaustic, Anne; Sanchez, Corinne; Cartier, C.; Verdaguer, Michel

doi:10.1021/ic00291a024

Cited by 195 publications

(141 citation statements)

References 2 publications

(3 reference statements)

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“…A bonding between lead and titanium atom is thus firmly established. The Ti-O and Ti-Ti distances agree with the values reported by Babonneau et al [10] for Ti(OnBu)4. Detailed structural study of Pb-Ti and PbZr precursors will be published elsewhere [11].…”

Section: Resultssupporting

confidence: 91%

A study of amorphous precursors for PbZrO3−PbTiO3 based ceramic materials

Malič

Arčon

Kosec

et al. 1997

J Sol-Gel Sci Technol

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Abstract. Amorphous precursors for PbZrO3 and PbTiO3 ceramics were prepared from lead acetate and the transition metal n-propoxide in n-propanol or n-butoxide in n-butanol and hydrolysed with an excess of water.According to GLC and TGA/EGA analyses, the type of alkoxide group influences distinctly the structure of heterometallic precursors, i.e., oxo or acetate bridging, and the amounts of hydroxyl and organic groups bound to the metal network.The local environments of metal atoms in the amorphous precursors were also studied by EXAFS. The analysis reveals that in Pb-Zr precursors alkoxide groups modify the coordination spheres of the zirconium atoms. Conversely, local environments of both lead and titanium atoms within the analysed range of 3.4 A depend weakly on the type of alkoxide used.

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Section: Resultssupporting

confidence: 91%

A study of amorphous precursors for PbZrO3−PbTiO3 based ceramic materials

Malič

Arčon

Kosec

et al. 1997

J Sol-Gel Sci Technol

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“…Its height relative to that of the K-edge is a measure of the fraction of Ti in tetrahedral coordination. 19 Comparison with literature XANES spectra of TiMCM-41confirmed the high yield of tetrahedrally substituted Ti centers. 20 Furthermore, the UV diffuse reflectance spectra of the material (Shimadzu model UV-2100 spectrometer equipped with an integrating sphere model ISR-260) exhibit an absorption with an onset at 330 nm ( Figure 1b).…”

Section: Methodsmentioning

confidence: 54%

CO₂ Splitting by H₂O to CO and O₂ under UV Light in TiMCM-41 Silicate Sieve

2004

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The 266 nm light-induced reaction of CO 2 and H 2 O gas mixtures (including isotopic modifications 13 CO 2 , C 18 O 2 , and D 2 O) in framework TiMCM-41 silicate sieve was monitored by in-situ FT-IR spectroscopy at room temperature. Carbon monoxide gas was observed as the sole product by infrared, and the growth was found to depend linearly on the photolysis laser power. H 2 O was confirmed as stoichiometric electron donor. The work establishes CO as the single photon, 2-electron transfer product of CO 2 photoreduction by H 2 O at framework Ti centers for the first time. O 2 was detected as co-product by mass spectrometric analysis of the photolysis gas mixture. These results are explained by single UV photon-induced splitting of CO 2 by H 2 O to CO and surface OH radical.

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“…10B spectrum (a), the observed signal was divided by 10 to facilitate comparison with other spectra shown in the panel). The peak intensity of this pre-edge band relative to the height of the plateau between K-edge 54 and the onset of the EXAFS region is close to one, which implies that essentially all Cr centers are in tetrahedral Cr VI configuration. .…”

Section: Tioco Unitsmentioning

confidence: 71%