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Issue 8, 2011
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Synthesis of a new nanocrystalline titanium aluminum fluoride phase by reaction of Ti2AlC with hydrofluoric acid

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Abstract

A new nanocrystalline phase of titanium aluminum fluoride, with a stoichiometry of Ti2AlF9—exact stoichiometry measured herein is Ti2.1Al0.9F9,—was synthesized by the fluorination of Ti2AlC in anhydrous hydrofluoric acid at 55 °C for 2 h. The results from X-ray diffraction, scanning and high-resolution transmission electron microscopy and selected area diffraction, together with crystal structure solution via simulated annealing, confirmed the formation of a nanocrystalline material with a trigonal structure belonging to the R3 space group. The structure can also be viewed as being comprised of corner-sharing octahedra that are arranged in a distorted simple cubic arrangement. Thermogravimetric analysis, in argon, indicates that this phase is stable up to ≈ 850 °C. Density functional theory calculations estimate the band gap to be ≈ 5 eV and the bulk modulus to be ≈ 109 GPa.

Graphical abstract: Synthesis of a new nanocrystalline titanium aluminum fluoride phase by reaction of Ti2AlC with hydrofluoric acid

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Supplementary files

Article information


Submitted
30 Jun 2011
Accepted
15 Aug 2011
First published
06 Oct 2011

RSC Adv., 2011,1, 1493-1499
Article type
Paper

Synthesis of a new nanocrystalline titanium aluminum fluoride phase by reaction of Ti2AlC with hydrofluoric acid

M. Naguib, V. Presser, N. Lane, D. Tallman, Y. Gogotsi, J. Lu, L. Hultman and M. W. Barsoum, RSC Adv., 2011, 1, 1493
DOI: 10.1039/C1RA00390A

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