MEASUREMENT OF RADII OF CURVATURE OF SLIGHTLY BENT CRYSTALS USING A ONE-DIMENSIONAL DETECTOR

A new x-ray diffraction method is described for measuring radii of cur vature of crystals using a one-dimensional solid-state detector togeth er with an extremely parallel incident x-ray beam. The present method is based on the measurement of the slope of loci of rocking curve maxi mum in a contour map of x-ray rocking curves versus position on the sa mple. The detection limit for the radius of curvature is estimated to be a few thousand meters using this method. The local variation of the curvature over a sample is easily revealed and precisely determined f rom the contour map of x-ray rocking curves. Several examples of curva ture determination by the present method are presented and compared wi th the results of the commonly used double-crystal diffractometer meth od.