Mesostructured Silica Fibers: Ring Structures in Reciprocal Space

Mesostructured silica fibers constitute a class of highly ordered solidswhose reciprocal space consists of well-defined extended ring structures (see Figure). Their X-ray diffraction spots cannot be described by the Bragg equation: As described here, they exhibit unusual intensity differences between symmetry-related spots and local minima arising from the circular fiber architecture (see also cover).