Crystal growth kinetics of iron fluoride trihydrate
2006 (English)In: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 296, no 2, 213-220 p.Article in journal (Refereed) Published
Crystal growth of beta-FeF3 • 3H(2)O has been investigated in mixtures of 3 mol kg(-1) hydrofluoric acid and 3 mol kg(-1) nitric acid at 30, 40 and 50 degrees C. Seeded isothermal desupersaturation experiments have been performed in the range: 1.3 < S < 3.6. Solution samples were analysed for total iron concentration with inductively coupled plasma atomic emission spectroscopy. The true supersaturation driving force was estimated by a proper speciation using the software SSPEC using appropriate stability constants. Growth rate parameters of the BCF surface diffusion growth rate equation and the empirical power-law equation have been estimated by fitting the supersaturation balance equation using a nonlinear optimization procedure. The results show that the growth rate is surface integration controlled. The growth rate at a supersaturation ratio of 2 was found to be 3.5 x 10(-12) m s(-1) at 30 degrees C, 7.4 x 10(-12) m s(-1) at 40 degrees C and 16 x 10(-12) m s(-1) at 50 degrees C. The activation energy of the rate constant of crystal growth was found to be 61 kJ mol(-1). .
Place, publisher, year, edition, pages
Royal Inst Technol, Dept Chem Engn & Technol, KTH, S-10044 Stockholm, Sweden., 2006. Vol. 296, no 2, 213-220 p.
growth from solutions, acids, inorganic compounds, WATER EXCHANGE, BETA-FEF3.3H2O, DISSOLUTION, FEF3.3H2O, MOSSBAUER, IRON(III), MIXTURES
IdentifiersURN: urn:nbn:se:kth:diva-14094DOI: 10.1016/j.jcrysgro.2006.08.035ISI: 000242325300014ScopusID: 2-s2.0-33750515216OAI: oai:DiVA.org:kth-14094DiVA: diva2:329672
QC 201007132010-07-132010-07-132011-01-14Bibliographically approved