Abstract

A low-angle diffractometer designed for measuring the large interlayer spacings of swollen clay minerals is described. The instrument is equipped with a bent crystal monochromator. Adjustable slits are used to limit the aperture of the x-ray beam and the extension of the scattered radiation from the surface of the crystal to the most convenient values. The special mounting of the specimen allows the measurement of the angular distribution of diffracting particles and of its variation with swelling.

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