Raman study of alumina gels

Assih, Toyi; Ayral, A.; Abénoza, M.; Phalippou, J.

doi:10.1007/bf00551313

Cited by 103 publications

(56 citation statements)

References 18 publications

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“…A significant spectroscopic band at 840, 654, 600 and 460 cm −1 corresponds to Al-O vibration whereas band at 400 cm −1 corresponds to Ce-O vibration. The band at 460 [16] and 400 cm −1 [17] which are identified to be the characteristic absorption bands of ␣-Al 2 O 3 and CeO 2 . In addition to that, two absorption bands are observed in the region between 1500 and 1400 cm −1 with acetyl acetone, which are assigned to the vibration of C-C and C C bonds of acetyl acetone ligands attached with Al and Ce atoms.…”

Section: Resultsmentioning

confidence: 97%

Effect of different fuels on the alumina–ceria composite powders synthesized by sol–gel auto combustion method

Chandradass

Balasubramanian

Bae

et al. 2009

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 97%

Effect of different fuels on the alumina–ceria composite powders synthesized by sol–gel auto combustion method

Chandradass

Balasubramanian

Bae

et al. 2009

Journal of Alloys and Compounds

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“…3 was measured in air outside the Raman cell at room temperature, and is consistent with that reported previously. 24) Spectrum (b) was measured in air-saturated pure water at room temperature inside the Raman cell. Signal to noise ratio is slightly lowered than spectrum (a), but the specific Raman peaks are shown at the same positions as in spectrum (a).…”

Section: Resultsmentioning

confidence: 99%

An in Situ Raman Spectroscopy System for Long-term Corrosion Experiments in High Temperature Water up to 673 K

Domae

Tani

Fujiwara

et al. 2006

J. Nucl. Sci. Technol.

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A Raman spectroscopy system has been developed, in order to identify metal oxides formed on the surfaces of metals and steels in high temperature water up to 673 K. A supercritical water loop system including a Raman cell was installed. The design of the loop system is up to 673 K and 40 MPa. The Raman cell has a diamond window without window-to-metal packing. Raman spectrum of alumina plate was measured at room temperature, at 523 K and at 673 K under pressure of 25 MPa. A long-term measurement was also performed at 523 K and 25 MPa for 117.5 h. In all cases intense Raman peaks attributed to alumina were observed. Raman spectrum of anatase particles in suspension was measured at 673 K and 25 MPa. The results show that the Raman spectroscopy system developed in the present study works well not only for plate sample but also for suspension. Raman spectra observed for titanium plate in high temperature water of 673 K and 25 MPa show growth of several Raman peaks with time up to 257 h. The peaks disappeared after cooled down to room temperature. The experimental results have demonstrated importance of in situ Raman spectroscopy.

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“…After three hours, no other lines are evidenced. Phallipou et al in their recent study of alumina gels, did not observe new lines during the gelation process [21]. This is likely due to the absence of order in the so-obtained gel, as disordered materials always show broad lines in Raman spectroscopy.…”

Section: Figurementioning

confidence: 95%

Comparison of drying procedures for the preparation of alumina powders with the system Al-alkoxide/tertiary butanol/water

Ponthieu¹,

Payen²,

Pajonk

et al. 1997

J Sol-Gel Sci Technol

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Abstract. Two series of alumina gel precursors, obtained from AI sec-butylate, ASB, or AI tert-butylate, ATB, dissolved in tertiary butanol, TB, have been dried according to five procedures, in order to compare their efficiency and the consequences they may have on the structure of the final product. They consist of lyophilization (or freezedrying), evacuation at room temperature (with or without ageing of the gel), drying in an oven at atmospheric pressure, or under hypercritical conditions. Chemical analysis, X-Ray diffraction and spectroscopic characterizations (FTIR and laser Raman) allow the identification of the phases present. The temperature of the drying step, as well as the nature of the alkoxide percursor, considerably affect the final dried products.

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Raman study of alumina gels

Cited by 103 publications

References 18 publications

Effect of different fuels on the alumina–ceria composite powders synthesized by sol–gel auto combustion method

Effect of different fuels on the alumina–ceria composite powders synthesized by sol–gel auto combustion method

An in Situ Raman Spectroscopy System for Long-term Corrosion Experiments in High Temperature Water up to 673 K

Comparison of drying procedures for the preparation of alumina powders with the system Al-alkoxide/tertiary butanol/water

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