Formation of AgFeO2, alpha-FeOOH, and Ag2O from mixed Fe(NO3)(3)-AgNO3 solutions at high pH (CROSBI ID 192213)
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Podaci o odgovornosti
Krehula, Stjepko ; Musić, Svetozar
engleski
Formation of AgFeO2, alpha-FeOOH, and Ag2O from mixed Fe(NO3)(3)-AgNO3 solutions at high pH
Precipitation of ternary oxide silver ferrite (AgFeO2), iron oxyhydroxide goethite (α-FeOOH) and silver(I) oxide (Ag2O) from mixed Fe(NO3)3–AgNO3 solutions in a whole [Ag+]:[Fe3+] concentration ratio range at high pH was investigated using X- ray powder diffraction (XRD), 57Fe Mössbauer, FT- IR and UV–Vis–NIR spectroscopies and field emission scanning electron microscopy (FE-SEM). Strong alkalis organic tetramethylammonium hydroxide (TMAH) or inorganic NaOH were used as precipitating agents. Monodispersed lath-like α- FeOOH particles were formed from a pure Fe(NO3)3 solution. The presence of Ag+ ions influenced the formation of the delafossite-type ternary oxide AgFeO2 beside α-FeOOH. The positions of XRD and Mössbauer lines did not suggest any significant incorporation of Ag+ ions into the α-FeOOH structure. AgFeO2 was formed in the precipitation system with the equimolar initial [Ag+]:[Fe3+] concentration ratio. The size and shape of AgFeO2 particles, as well as their structural polytype (2H or 3R), were dependent on reaction temperature, aging time and alkali used. In systems with an excess of Ag+ ions mixtures of AgFeO2 and Ag2O were formed. Single phase Ag2O precipitated from a pure AgNO3 solution.
Silver ferrite ; Goethite ; Silver oxide ; XRD ; 57Fe Mössbauer ; FE-SEM
Rad je prezentiran na skupu XXXIst European Congress on Molecular Spectroscopy "Molecular spectroscopy and molecular structure 2012", održanom od 26.–31.08.2012.g., Cluj-Napoca, Rumunjska.
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Podaci o izdanju
1044
2013.
221-230
objavljeno
0022-2860
1872-8014
10.1016/j.molstruc.2012.11.012