Microstructure in ammonium dihydrogen phosphate crystals induced by clays during growth
During a study of habit modification of crystals of NH4H2PO4 various clays were added as impurities to the solutions in order to determine the effect of colloidal particles in suspension on crystal growth. The results are of interest for the following two reasons: 1. they indicate the relative degree of reactivity of the clays with the solutions, and 2. they show that interesting growth features, some visible to the unaided eye, and others visible by means of the electron microscope, form as a result of the presence of the clays. The growth features are unique in that they are not observed on fracture surfaces of the pure crystals or on habit-modified crystals grown from solutions containing certain metal ions as impurities.
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