Growth and morphology of mixed K1-x(NH4)xH2PO4 crystals
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Date
2010
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Publisher
Elsevier Ltd
Abstract
Mixed crystals of ammonium dihydrogen orthophosphate (ADP) and potassium dihydrogen orthophosphate (KDP), i.e., potassium ammonium dihydrogen phosphate, K<inf>1-x</inf>(NH<inf>4</inf>)<inf>x</inf>H<inf>2</inf>PO<inf>4</inf> have been grown by slow evaporation from the supersaturated solution at an ambient temperature 26 ± 1 °C for ammonium concentration x in the range 0.0 ? x ? 1.0. The morphology changes from tetragonal prism to needles when the concentration of either of the components approaches that of the other. Induction periods were measured for various compositions of mixed crystals of ADP and KDP by the direct vision method. Crystal compositions were determined by flame atomic absorption spectroscopy and also by chemical analysis. Results of the X-ray analysis of the grown crystals are also reported. Maximum size of the grown mixed crystal was around 16 × 10 × 4 mm3. © 2010 Elsevier B.V. All rights reserved.
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Keywords
Absorption spectroscopy, Chemical analysis, Energy dispersive X ray analysis, Inorganic compounds, Morphology, Potassium compounds, Ammonium concentrations, Component approaches, Crystal composition, Dihydrogen, Direct vision method, Induction periods, Mixed crystals, Morphology changes, Slow evaporation, Supersaturated solutions, X ray diffraction analysis
Citation
Materials Science and Engineering: B, 2010, 167, 3, pp. 206-209