A mechanism for the habit modification of ammonium dihydrogen phosphate crystals in the presence of ionic species in aqueous solution

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Ammonium dihydrogen phosphate (ADP) crystals develop new high index faces when grown from aqueous solution containing up to 1000 ppm of added CrCl3 · 6 H2O. The crystallographic nature of these faces has been studied as a function of the CrCl3 · 6 H2O concentration in the growth solution (24.0°C, σ = 0.06) and their high morphological importance is explained, using a modification of the Hartman‐Perdok theory of crystal morphology, but postulating that the adsorption of impurity species at specific sites transform K‐faces into pseudo‐F‐faces.