Influence of Silicon and Phosphorus on Structural and Magnetic Properties of Synthetic Goethite and Related Oxides
Very low level incorporation produced materials having structural and spectral properties similar to those of poorly crystalline synthetic or natural goethite. At higher incorporation levels, mixtures of noncrystalline materials were obtained which exhibited Mossbauer spectra typical of noncrystalline materials mixed with a superparamagnetic component. Microbeam electron diffraction indicated that these mixtures contained poorly crystalline goethite, poorly crystalline ferrihydrite, and a noncrystalline component. If the material was prepared with no aging of the alkaline Fe**3** plus solution before the addition of Na//2HPO//4 or Na//2SiO//3, materials were obtained containing little if any superparamagnetic component. If the alkaline Fe**3** plus solution was aged for 48 hr before the addition, goethite nuclei formed and apparently promoted the precipitation of a superparamagnetic phase. Additional study results are discussed.
T. G. Quin et al., "Influence of Silicon and Phosphorus on Structural and Magnetic Properties of Synthetic Goethite and Related Oxides," Clays and Clay Minerals, vol. 36, no. 2, pp. 165-175, The Clay Minerals Society, Jan 1988.
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