Kinetics of solution crystal growth of strengite, FePO4,2H2O
Abstract
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.
- Publication:
-
Journal of Crystal Growth
- Pub Date:
- January 2018
- DOI:
- 10.1016/j.jcrysgro.2017.10.014
- Bibcode:
- 2018JCrGr.482....9L
- Keywords:
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- A1. Surface processes;
- A2. Growth from solutions;
- B1. Minerals;
- B1. Iron compounds;
- B1. Phosphates