Structures of β-FeOOH Particles Formed in the Presence of Ti(IV), Cr(III), and Cu(II) Ions

Ishikawa, Tatsuo; Motoki, Taiki; Katoh, Ryuichi; Yasukawa, Akemi; Kandori, Kazuhiko; Nakayama, Tsuneyoshi; Yuse, Fumio

doi:10.1006/jcis.2002.8257

Cited by 49 publications

(30 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some elements have been found to strongly influence the formation, structure, and morphology of the -FeOOH andFe 2 O 3 particles in aqueous solution systems. [5][6][7] However, further experimental studies about the effects of cations and anions on the formation of the corrosion products are essential for the investigation of the corrosion processes. Silicon (Si) is one of the most important elements of steel and often used as an alloying element so as to improve their corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Silicate Ions on Conversion of Ferric Hydroxide to β-FeOOH and α-Fe2O3

et al. 2005

View full text Add to dashboard Cite

Ferric hydroxide (Fe(OH) 3 ) gel, prepared from FeCl 3 and NaOH solutions, was aged at 100 C in the presence and absence of silicate ions to examine the effect of silicate ions on the conversion process of condensed Fe(OH) 3 gel to iron oxides. The aged suspensions containing colloidal particles in each stage were separated into solid particles and supernatant solutions by centrifugation. X-ray diffraction measurements and transmission electron microscopic observations of the solid particles revealed that -FeOOH was formed from the Fe(OH) 3 gel and subsequently converted into -Fe 2 O 3 , and the addition of silicate ions in the Fe(OH) 3 gel decreased the conversion rate to -FeOOH andFe 2 O 3 particles. IR measurements of the solid particles and inductively coupled plasma analyses of the supernatant solutions showed that the adsorption of silicate ions on specific plane of the solid particles was decisive factor for the suppression of the conversion process.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Silicate Ions on Conversion of Ferric Hydroxide to β-FeOOH and α-Fe2O3

et al. 2005

View full text Add to dashboard Cite

show abstract

“…8,9) As related to the stability of -FeOOH, the effects of metallic ions on the formation and structure of -FeOOH particles have been reported. 10,11) The results show that some alloying elements, especially titanium, strongly influences the formation ofFeOOH. These results may give a hint on the control of the stability of ferric oxyhydroxides.…”

Section: Introductionmentioning

confidence: 97%

Influence of Sulfate Ions on Conversion of Fe(OH)3 Gel to β-FeOOH and α-Fe2O3

et al. 2004

View full text Add to dashboard Cite

Powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and chemical analyses were used for characterizing the effect of sulfate ions on the conversion rate of condensed Fe(OH) 3 gel, prepared from FeCl 3 and NaOH solution, to -FeOOH and -Fe 2 O 3 particles by aging at 100 C. Fine particles and supernatant solution were sampled from the aged suspensions containing colloidal particles. XRD profiles and TEM observation showed that -FeOOH was formed from the gel and subsequently converted into -Fe 2 O 3 . It was revealed that the addition of sulfate ions accelerated the -FeOOH formation from the gel, but delayed the conversion from -FeOOH to -Fe 2 O 3 . The concentration changes of sulfate and chloride ions in the supernatant solution phases were in agreement with the conversion from Fe(OH) 3 gel to -FeOOH andFe 2 O 3 particles.

show abstract

“…In case of coexistence of chloride ions in the solution containing ferric ions, akaganeite β-FeOOH is known to be formed by hydrolysis of ferric species and the precipitates transformed finally into hematite α-Fe 2 O 3 by thermohydrolysis [1,2]. Recently, effects of cations or anions on the formation of akaganeite and its conversion to hematite have been focused and investigated [3][4][5][6]. The results indicated that some elements strongly influence the reaction rate, formation and morphology of final products in aqueous solution systems.…”

Section: Introductionmentioning

confidence: 99%

Influence of Anion Coexistence on Crystal Structure of Iron Oxides Deposited from Steel Surfaces

Shinoda

Kwon²,

Suzuki

et al. 2008

e-J. Surf. Sci. Nanotechnol.

View full text Add to dashboard Cite

The EXAFS analysis of ferric oxide particles precipitated from ferric aqueous solutions including chloride ion and with/without additional anions such as sulfate or silicate. In the solution reaction process, an akaganeite (β-FeOOH)-like oxyhydroxide with low crystallinity is precipitated and subsequently transforms to hematite (α-Fe2O3). Coexistence of anion species of sulfate or silicate is effective to reduce the rate of structural transformation and influence morphology of final iron oxide products. The radial distribution functions was obtained by Fourier transformation from EXAFS spectra measured at Fe K absorption edge, and Debye-Waller factor related to Fe-Fe correlation was determined. The results indicated that the linkages with face-sharing and double-corner-sharing were influenced by adding anions in corrosion reaction solutions.

show abstract

Structures of β-FeOOH Particles Formed in the Presence of Ti(IV), Cr(III), and Cu(II) Ions

Cited by 49 publications

References 19 publications

Effect of Silicate Ions on Conversion of Ferric Hydroxide to β-FeOOH and α-Fe<SUB>2</SUB>O<SUB>3</SUB>

Effect of Silicate Ions on Conversion of Ferric Hydroxide to β-FeOOH and α-Fe<SUB>2</SUB>O<SUB>3</SUB>

Influence of Sulfate Ions on Conversion of Fe(OH)<SUB>3</SUB> Gel to β-FeOOH and α-Fe<SUB>2</SUB>O<SUB>3</SUB>

Influence of Anion Coexistence on Crystal Structure of Iron Oxides Deposited from Steel Surfaces

Contact Info

Product

Resources

About

Structures of β-FeOOH Particles Formed in the Presence of Ti(IV), Cr(III), and Cu(II) Ions

Cited by 49 publications

References 19 publications

Effect of Silicate Ions on Conversion of Ferric Hydroxide to &beta;-FeOOH and &alpha;-Fe<SUB>2</SUB>O<SUB>3</SUB>

Effect of Silicate Ions on Conversion of Ferric Hydroxide to &beta;-FeOOH and &alpha;-Fe<SUB>2</SUB>O<SUB>3</SUB>

Influence of Sulfate Ions on Conversion of Fe(OH)<SUB>3</SUB> Gel to &beta;-FeOOH and &alpha;-Fe<SUB>2</SUB>O<SUB>3</SUB>

Influence of Anion Coexistence on Crystal Structure of Iron Oxides Deposited from Steel Surfaces

Contact Info

Product

Resources

About

Effect of Silicate Ions on Conversion of Ferric Hydroxide to β-FeOOH and α-Fe<SUB>2</SUB>O<SUB>3</SUB>

Effect of Silicate Ions on Conversion of Ferric Hydroxide to β-FeOOH and α-Fe<SUB>2</SUB>O<SUB>3</SUB>

Influence of Sulfate Ions on Conversion of Fe(OH)<SUB>3</SUB> Gel to β-FeOOH and α-Fe<SUB>2</SUB>O<SUB>3</SUB>