TY - JOUR AU - Madsen, Hans Erik Lundager AU - Koch, Christian Bender PY - 2018 TI - Nucleation and Crystal Growth Kinetics of Strengite, FePO4,2H2O, in Aqueous Solution JF - Quarterly Physics Review; Vol 4 No 3 (2018): Vol. 4 Issue 3, July 2018 DO - 10.18103/qpr.v4i3.1772 KW - N2 - Crystallization kinetics of strengite, FePO 4 2 ,2H O, has been investigated by direct mixing of ammonium phosphate solution with a solution containing either iron(III) or iron(II) plus hydroxylamine, the latter acting as oxidant on the surface of growing iron phosphate crystals. Nucleation rate was determined by light scattering and crystal growth rate from pH recording. From the former was found a relatively uncertain surface fre energy of 127 mJ/m² with Fe(III) and a much more precise value of 55 mJ/m² with Fe(II) + HONH 2 . Crystal growth was shown to take place mainly by surface nucleation, either the mononuclear or the polynuclear mechanism, and yielded edge free energies of 86-92 pJ/m with Fe(III) and 13-22 pJ/m with Fe(II) + HONH 2 . The large differences may be interpreted in terms of a Fe(II)-rich monolayer on crystals growing from solution containing iron(II) and hydroxylamine. UR - https://esmed.org/MRA/qpr/article/view/1772