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See detailMagnetism and lattice dynamics of FeNCN compared to FeO
Herlitschke, M.; Tchougréeff, A. L.; Soudackov, A. V. et al

in New Journal of Chemistry (2014), 38(10), 4670-4677

Three-dimensional non-oxidic extended frameworks offer the possibility to design novel materials with unique properties, which can be different from their oxide analogues. Here, we present first ... [more ▼]

Three-dimensional non-oxidic extended frameworks offer the possibility to design novel materials with unique properties, which can be different from their oxide analogues. Here, we present first experimental results concerning unusual magnetic properties of FeNCN, investigated using Mössbauer spectroscopy and magnetometry between 5 and 380 K. This study reveals an unconventional behaviour of the magnetic parameters below the Néel temperature of 350 K, i.e., the hyperfine field on iron decreases with decreasing temperature. At room temperature, quadrupole and hyperfine magnetic field interaction energies are comparable in magnitude, which leads to a rare five-line absorption spectrum. We suggest that these features in the hyperfine field are caused by the combination of a small Fermi contact term and a temperature-dependent contribution from the orbital momentum and the dipole term. One additional spectral component is observed, which exhibits a magnetic relaxation behaviour and slows down at low temperatures to yield a sextet. The magnetometry data suggest that the antiferromagnetic FeNCN is rich in structural distortions, which results in a splitting of the field-cooled and zero-field-cooled curves. The lattice dynamics of FeNCN were investigated using nuclear inelastic scattering. The comparison of the obtained data with literature data of iron monoxide reveals very similar iron phonon modes with a small softening and a slightly reduced sound velocity. This journal is © the Partner Organisations 2014. [less ▲]

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See detailSynthesis and physico-chemical characterization of bolaamphiphiles derived from alkenyl D-xylosides
Deleu, Magali ULg; Damez, Céline; Gatard, Sylvain et al

in New Journal of Chemistry (2011), 35

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See detailSurface modification of as-synthesized lamellar mesostructured silica obtained by liquid crystal templating
Henrist, Catherine ULg; Vogels, C.; Rulmont, André ULg et al

in New Journal of Chemistry (2005), 29(8), 1017-1021

We report a study of lamellar silica phase silylation, starting from as-synthesized silica, without the usual heat treatment step. Characterizations of the modified silica include X-ray diffraction ... [more ▼]

We report a study of lamellar silica phase silylation, starting from as-synthesized silica, without the usual heat treatment step. Characterizations of the modified silica include X-ray diffraction, thermal analysis, electron microscopy and solid state NMR. Special attention is given to the possibility of keeping the lamellar organisation along with the elimination of the organic template. [less ▲]

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