Crystal orientation measurements of samples containing coarse grains

Pole figure measurement is an important measurement technique for determining the crystal orientation of a sample or calculating the volume fraction of the orientation. Especially for the latter, it is crucial that the measured intensities are equal to the true intensities. Some reduction in intensity due to defocus can be compensated using defocus corrections, but for samples containing coarse grains, the further development of measurement techniques is necessary.

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To achieve accurate diffraction intensities, it is essential that the grain size of crystals in a sample is less than 10 µm. For bigger grains, diffraction intensities vary due to shifts of the measurement point or the X-ray incident angle to the sample. Since the pulverization of samples is not possible for pole figure measurements, it is necessary to perform measurements while oscillating the sample.

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