What specifications can you provide for crystallinity ?
We are frequently asked to guarantee the width of the specular reflection of a crystal, in particular for demanding applications like X-ray standing waves (XSW). The answer to this question is that we cannot guarantee an exact number and can only offer the smallest possible width on a best-effort basis. To begin with, all crystals that exhibit any appreciable form of mosaicity in our Laue system are tossed out of production. Second, the width of specular or surface reflections is in no small part affected by the polishing procedure. The polishing that we perform on crystalline metal surfaces always leaves a distorted cold work layer that needs to be annealed prior to achieving the ultimate crystallinity. This ultimate crystallinity, which is ideally identical to the quality of the source rod, is only achieved in-situ at the end-user facility and is therefore beyond our control. Third, the equipment that we use to align crystals lacks the possibility to evaluate the quality of a single crystal at the same level of detail that is possible in e.g. modern third generation synchrotrons. Hence we can only commit to providing the best crystallinity on a best-effort basis, but are more than willing to tailor our preparation and polishing procedures towards your experiments, if so requested.