Crystallization of metal fluoride hydrates from mixed hydrofluoric and nitric acid solutions, Part I: Iron (III) and Chromium (III)
2010 (English)In: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 312, no 16-17, 2351-2357 p.Article in journal (Refereed) Published
Crystallization from hydrofluoric acid/nitric acid solutions supersaturated with Fe(III) and Cr(III) has been investigated. Iron and chromium crystallizes into a solid solution in the form of Cr(Fe)F-3 center dot 3H(2)O, which is isostructural with CrF3 center dot 3H(2)O and alpha-FeF3 center dot 3H(2)O. By seeded isothermal desupersaturation experiments, the growth rate of beta-FeF3 center dot 3H(2)O crystals at 50 degrees C has been studied in hydrofluoric acid and nitric acid solutions containing Cr(III). It is found that the growth rate of beta-FeF3 center dot 3H(2)O is essentially uninfluenced by the presence of 5 g/kg Cr(III). At 50 degrees C and a supersaturation ratio of 2 (c(FeF3)(free)/c(s)(FeF3)(free)), the growth rate is (0.8-2.2) x 10(-11) m/s in 3 mol/(kg solution) HFfree and 3 mol/(kg solution) HNO3.
Place, publisher, year, edition, pages
2010. Vol. 312, no 16-17, 2351-2357 p.
Supersaturated solutions, Growth from solutions, Acids, Inorganic compounds
IdentifiersURN: urn:nbn:se:kth:diva-29438DOI: 10.1016/j.jcrysgro.2010.05.015ISI: 000280256400013ScopusID: 2-s2.0-77955277117OAI: oai:DiVA.org:kth-29438DiVA: diva2:397492
QC 201102152011-02-152011-02-022011-02-15Bibliographically approved