Funct. Mater. 2014; 21 (3): 324-328.
Study on lithium dihydrogen phosphate crystal growth conditions in nonstoichiometric solutions
[1] Institute for Single Crystals, STC "Institute for Single Crystals"National Academy of Sciences of Ukraine, 60 Lenin Ave., 61001 Kharkiv, Ukraine
[2] O.Usikov Institute for Radiophysics and Electronics, National Academy of Sciences of Ukraine, 12 Proskura Str., 61085 Kharkiv, Ukraine
Based on analysis of lithium dihydrogen phosphate (LDP) solubility dependence on solution stoichiometry alteration, solvent evaporation rate impact on solution supersaturation change is evaluated. It is revealed that at constant crystal growth rate relative solution supersaturation linearly depends on water evaporation rate. LDP nonstoichiometric saturated solution (20 % H3PO4 excess) stability boundary conditions are determined. Water evaporation rate is 0.5 %/24 h and supersaturation σ is 0.6 %/24 h, respectively. LDP nonstoichiometric solutions density and viscosity are measured.
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