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The technique of oblique-texture diffraction on powder mounts with a strong preferred orientation of platelets, which has been used in electron diffraction, is extended to X-rays. It allows an easy recording of reflections that are otherwise lost in composite peaks or difficult to observe and measure in powder patterns. The technique is flexible and has important advantages: the photographs can be taken on any instrument permitting a controlled tilting of the mount, such as the widely available precession or Weissenberg single-crystal cameras; the sample is X-rayed in air, not in vacuum, and hydrated phases can thus be examined; by varying tilt of the sample and the X-ray wavelength, a good resolution of diffraction spots can be achieved that, in turn, facilitates interpretation of the patterns or measurement of intensities. As the preferred orientation approaches ideality, the information provided by an oblique-texture X-ray photograph approaches that from a single-crystal rotation pattern.

Oblique-texture X-ray photographs: more information from powder diffraction