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24 European Crystallographic Meeting, ECM24, Marrakech, 2007 Page s275 Acta Cryst. (2007). A63, s275 are composed of plate-like fragments of tridymite/cristobalite layers, whereas obsidian contains quartz nanocrystals with abundant moganite-like planar faults. Regarding atmospheric soot particles, a characteristic shift of the first nearest-neighbour interatomic distance was observed. Interatomic distances are proved to be as small as 0.134 nm, much shorter than in graphite (0.142 nm) or in amorphous carbon (0.141–143 nm), but larger than the typical value (0.131–0.132 nm) for a kerogen with significant hydrogen content (H/C=0.61). These results suggest that the first nearest neigbour interatomic distance measurable in soot is the superposition of first-neighbour C–C distances and C–H distances (around 0.143 and 0.11 nm, respectively). Hydrogen is related to the aromatic components in soot which can strongly influence the optical properties of soot particles. Quantitative electron diffraction has proved to be an efficient method for studying the nanostructures of highly disordered geological materials.

CompoundsAMO4(A= Ca, Sr, Ba;M= W, Mo) with scheelite structure: growth, composition, structure peculiarities

CompoundsAMO₄(A= Ca, Sr, Ba;M= W, Mo) with scheelite structure: growth, composition, structure peculiarities