Crystallization of metal fluoride hydrates from mixed hydrofluoric and nitric acid solutions, Part I, Iron (III) and Chromium (III)

Kerstin M. Forsberg; Åke C. Rasmuson

doi:10.1016/j.jcrysgro.2010.05.015

Crystallization of metal fluoride hydrates from mixed hydrofluoric and nitric acid solutions, Part I, Iron (III) and Chromium (III)

Kerstin M. Forsberg
, Åke C. Rasmuson

Retired Staff

KTH Royal Institute of Technology

Research output: Contribution to journal › Article › peer-review

Abstract

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)F₃·3H₂O, which is isostructural with CrF₃·3H₂O and α-FeF₃·3H₂O. By seeded isothermal desupersaturation experiments, the growth rate of β-FeF₃· 3H₂O crystals at 50 °C has been studied in hydrofluoric acid and nitric acid solutions containing Cr(III). It is found that the growth rate of β-FeF₃·3H₂O is essentially uninfluenced by the presence of 5 g/kg Cr(III). At 50 °C and a supersaturation ratio of 2 (c(FeF₃)_free/c_s(FeF₃) _free), the growth rate is (0.82.2)×10^-11 m/s in 3 mol/(kg solution) HF_free and 3 mol/(kg solution) HNO₃.

Original language	English
Pages (from-to)	2351-2357
Number of pages	7
Journal	Journal of Crystal Growth
Volume	312
Issue number	16-17
DOIs	https://doi.org/10.1016/j.jcrysgro.2010.05.015
Publication status	Published - 2010

Keywords

A1. Supersaturated solutions
A2. Growth from solutions
B1. Acids
B1. Inorganic compounds

Access to Document

10.1016/j.jcrysgro.2010.05.015

Cite this

@article{5a1461d9edb64c51a0b51441ef3e406e,

title = "Crystallization of metal fluoride hydrates from mixed hydrofluoric and nitric acid solutions, Part I, Iron (III) and Chromium (III)",

abstract = "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)F3·3H2O, which is isostructural with CrF3·3H2O and α-FeF3·3H2O. By seeded isothermal desupersaturation experiments, the growth rate of β-FeF3· 3H2O crystals at 50 °C has been studied in hydrofluoric acid and nitric acid solutions containing Cr(III). It is found that the growth rate of β-FeF3·3H2O is essentially uninfluenced by the presence of 5 g/kg Cr(III). At 50 °C and a supersaturation ratio of 2 (c(FeF3)free/cs(FeF3) free), the growth rate is (0.82.2)×10-11 m/s in 3 mol/(kg solution) HFfree and 3 mol/(kg solution) HNO3.",

keywords = "A1. Supersaturated solutions, A2. Growth from solutions, B1. Acids, B1. Inorganic compounds",

author = "Forsberg, \{Kerstin M.\} and Rasmuson, \{{\AA}ke C.\}",

year = "2010",

doi = "10.1016/j.jcrysgro.2010.05.015",

language = "English",

volume = "312",

pages = "2351--2357",

journal = "Journal of Crystal Growth",

issn = "0022-0248",

number = "16-17",

}

TY - JOUR

T1 - Crystallization of metal fluoride hydrates from mixed hydrofluoric and nitric acid solutions, Part I, Iron (III) and Chromium (III)

AU - Forsberg, Kerstin M.

AU - Rasmuson, Åke C.

PY - 2010

Y1 - 2010

N2 - 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)F3·3H2O, which is isostructural with CrF3·3H2O and α-FeF3·3H2O. By seeded isothermal desupersaturation experiments, the growth rate of β-FeF3· 3H2O crystals at 50 °C has been studied in hydrofluoric acid and nitric acid solutions containing Cr(III). It is found that the growth rate of β-FeF3·3H2O is essentially uninfluenced by the presence of 5 g/kg Cr(III). At 50 °C and a supersaturation ratio of 2 (c(FeF3)free/cs(FeF3) free), the growth rate is (0.82.2)×10-11 m/s in 3 mol/(kg solution) HFfree and 3 mol/(kg solution) HNO3.

AB - 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)F3·3H2O, which is isostructural with CrF3·3H2O and α-FeF3·3H2O. By seeded isothermal desupersaturation experiments, the growth rate of β-FeF3· 3H2O crystals at 50 °C has been studied in hydrofluoric acid and nitric acid solutions containing Cr(III). It is found that the growth rate of β-FeF3·3H2O is essentially uninfluenced by the presence of 5 g/kg Cr(III). At 50 °C and a supersaturation ratio of 2 (c(FeF3)free/cs(FeF3) free), the growth rate is (0.82.2)×10-11 m/s in 3 mol/(kg solution) HFfree and 3 mol/(kg solution) HNO3.

KW - A1. Supersaturated solutions

KW - A2. Growth from solutions

KW - B1. Acids

KW - B1. Inorganic compounds

UR - https://www.scopus.com/pages/publications/77955277117

U2 - 10.1016/j.jcrysgro.2010.05.015

DO - 10.1016/j.jcrysgro.2010.05.015

M3 - Article

AN - SCOPUS:77955277117

SN - 0022-0248

VL - 312

SP - 2351

EP - 2357

JO - Journal of Crystal Growth

JF - Journal of Crystal Growth

IS - 16-17

ER -

Crystallization of metal fluoride hydrates from mixed hydrofluoric and nitric acid solutions, Part I, Iron (III) and Chromium (III)

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this