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Growth of single crystals of NaH2PO4 (NaDP), NaH2PO4 · H2O (NaDP · H2O), and NaH2PO4 · 2H2O (NaDP · 2H2O) sodium dihydrogenphosphate based on the analysis of the Na2O-P2O5-H2O phase diagram
Authors:L V Soboleva and A é Voloshin
Institution:(1) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 117333, Russia
Abstract:The crystallization conditions for the NaH2PO4, NaH2PO4 · H2O, and NaH2PO4 · 2H2O solid phases have been established from the analysis of the phase diagram of solubility of the ternary Na2O-P2O5-H2O system in the temperature range from 0 to 100°C. Based on these data, the methods for growing sodium dihydrogenphosphate single crystals of the above compositions are developed. The initial components for preparing mother solutions were H3PO4 and NaOH solutions taken in certain weight ratios. For the first time, NaDP, NaDP · H2O, and NaDP · 2H2O single crystals were grown on a seed by the method of temperature decrease. The habits of the NaDP and NaDP · H2O single crystals are determined. __________ Translated from Kristallografiya, Vol. 47, No. 5, 2002, pp. 937–944. Original Russian Text Copyright ? 2002 by Soboleva, Voloshin.
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