Naslov
The influence of Cr-dopant on the properties of α -FeOOH particles precipitated in highly alkaline media

Autori
Krehula, Stjepko ; Musić, Svetozar

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
E-MRS 2007 Fall Meeting - Book of Abstracts / - : Conference Engine © ; pielaszek research, 2007, 164-164

ISBN
83-89585-16-2

Skup
E-MRS 2007 Fall Meeting

Mjesto i datum
Varšava, Poljska, 17.09.2007. - 21.09.2007

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
α -FeOOH ; chromium ; tetramethylammonium hydroxide ; XRD ; ⁵⁷Fe Mössbauer ; FT-IR ; FE-SEM

Sažetak
The effects of Cr-dopant on the phenomenology of the precipitation of acicular α -FeOOH particles, the formation of solid solutions, particle size and shape were investigated using X-ray powder diffraction (XRD), Mössbauer and Fourier transform infrared (FT-IR) spectroscopies and field emission scanning electron microscopy (FE-SEM). Acicular and monodisperse α -FeOOH particles were precipitated at a very high pH by heating suspension obtained by adding tetramethylammonium hydroxide solution into aqueous solution of FeCl3. Influence of Cr-dopant was investigated by addition of various amounts Cr³⁺ ions into starting FeCl₃ solution, where r = 100• [Cr]/([Cr]+[Fe]) represents the degree of Cr addition. XRD analysis of the obtained powders (with r value from 0 to 23.08) showed the presence only of the diffraction lines characteristic of α -FeOOH. Mössbauer spectroscopy showed a decrease in hyperfine magnetic field values of α -FeOOH sextets with an increase in Cr-addition which indicates Cr incorporation into α -FeOOH structure. OH bending bands in FT-IR spectra showed only the slight change in position with increase in r, but the considerable increase in lattice band wave number indicates a decrease in thickness of α -FeOOH particles. This conclusion was confirmed by FE-SEM observations

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA