Abstract

The direction of the polar axis of the potassium biphthalate (KAP) crystal was determined by anomalous X-ray scattering (λCu). According to the etching pattern on the same sample, the positive direction of the axis corresponds to the slow-growing end of the crystal. Crystal chemical features of the main faces of the KAP crystal ({111} and {111} pyramids, {010} pinacoid, and {110} prism) were revealed. This allowed us to explain the anisotropy of impurity (ethylene glycol, di- or trivalent metal cations) effects on the growth of separate faces of the crystal.

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