Abstract
Essential parameters for the application of crystals toquantitative X-ray spectroscopy are the upper wavelength limit and thequantitative reflection properties (intrinsic resolving power,luminosity) of the crystal. Due to the large lattice constant,muscovite, a mica group mineral, can be used in the wavelength rangeup to about 2nm. Muscovite crystals can be bent to small radii ofcurvature due to their favourable cleavage and elastic properties.Characteristic reflection properties at reflections 002 – 00 24were investigated theoretically and experimentally. The integratedreflectivity was calculated for various reflections of perfect flat aswell as spherically bent muscovite crystals with curvature radii R = 100 and R = 186mm. It was measured for flat crystalsin the reflections 00 10 – 00 26 using CuKα- andMoKα-radiation from X-ray tubes and compared with calculationsfor both perfect and mosaic crystals. Available high-quality muscovitecrystals have a mosaic structure with a mosaic spread of about 1arcmin. This mosaic spread limits the spectral resolving power forhigh reflection orders.
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