Potassium permanganate (КMnO4) addition to the KDP (KН2PO4) solution increases the growth rate of the {100} faces and decreases that of the {101} ones. The complex ion MnНPO4+ is an impurity affecting {101} face growth rate. The Mn3+ ion replaces the K+ ion in the KDP structure and causes the change of hydrogen positions. The increase of the {100} face growth rate is connected with the capture of MnO2 partiсles. The doping of KDP crystals by Mn decreases the effective quadratic nonlinear sensitivity of crystals.
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