Kinetics of solution crystal growth of strengite, FePO^sub 4^,2H^sub 2^O

Kinetics of solution crystal growth of strengite, FePO^sub 4^,2H^sub 2^O

The iron(III) phosphate strengite, FePO4,2H2O, has been precipitated at 25 °C by mixing solutions of iron alum and ammonium phosphate. The rate of crystallization has been determined by pH recording. Three stages of crystal growth kinetics could be distinguished: (1) mononuclear growth, (2) polynucl...

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Veröffentlicht in:Journal of crystal growth 2018-01, Vol.482, p.9
Hauptverfasser: Lundager Madsen, Hans E, Koch, Christian Bender
Format: Artikel
Sprache:eng
Schlagworte:
Crystal growth
Crystallization
Crystals
Free energy
Iron
Iron compounds
Kinetics
Mossbauer spectroscopy
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Zusammenfassung:The iron(III) phosphate strengite, FePO4,2H2O, has been precipitated at 25 °C by mixing solutions of iron alum and ammonium phosphate. The rate of crystallization has been determined by pH recording. Three stages of crystal growth kinetics could be distinguished: (1) mononuclear growth, (2) polynuclear growth and, in a few cases, (3) spiral growth (BCF mechanism). From the first two, the value of edge free energy λ = 87 ± 1 pJ/m was found. The identity of the precipitate was verified by SEM, XRD and Mössbauer spectroscopy.
ISSN:0022-0248
1873-5002