Author
Fred Hazel
Bio: Fred Hazel is an academic researcher from University of Pennsylvania. The author has contributed to research in topics: Ferric & Chloride. The author has an hindex of 4, co-authored 7 publications receiving 101 citations.
Topics: Ferric, Chloride, Ion exchange, Boiling, Titration
Papers
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TL;DR: The products of boiling hydrolysis of ferric chloride solutions have been compared with well-known iron oxide phases by the use of i.r.t. and Mossbauer spectroscopy, electron microscopy, and chemical reactivity.
52 citations
TL;DR: In this article, the thermal behavior of the gelatinous residues obtained by slowly evaporating sols of hydrous oxides of aluminum, iron and chromium has been studied, and it was shown that only single oxide systems exhibited the glow phenomenon, i.e. glowed brightly when heated rapidly in open tubes, and gave exotherms with the differential thermal apparatus.
15 citations
01 Jun 1975
TL;DR: Mossbauer spectroscopic results indicated that aging the gel in a variety of ways produced poorly crystalline products (in agreement with their chemical reactivity) which had previously been identified as α-Fe 2 0 3 or mixtures of α -Fe 2 O 3 and α- FeOOH as mentioned in this paper.
Abstract: Mossbauer spectroscopic results indicated that aging the gel in a variety of ways produced poorly crystalline products (in agreement with their chemical reactivity) which had previously been identified as α-Fe 2 0 3 or mixtures of α-Fe 2 0 3 and α-FeOOH. The HFS of aged products as observed by Mossbauer spectroscopy is believed to be a sensitive indication of crystallinity; α-Fe 2 0 3 produced by heating the gel at 430°C for 48hr showed a 7% reduction in HFS compared to well-crystallized hematite. Finally, the thermal conversion of the gel to α-Fe 2 0 3 involved an intermediate structural state that was interpreted to mean considerable variety in the number and arrangement of ligands around the iron atoms, and a large distribution of magnetic fields. The state, observed after heating the gel for 18 hr at 320°C, gave an almost featureless Mossbauer absorption at room temperature.
13 citations
TL;DR: In this article, a volumetric method for the rapid determination of small amounts of uranium is proposed, where hexavalent uranium is reduced to the quadrivalent state by chromous chloride, the excess of which is destroyed by air oxidation.
11 citations
4 citations
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01 Mar 1978
TL;DR: In this article, the methods of preparation of ferric hydrous oxide sots consisting of particles, uniform in shape, of narrow size distribution are described in detail, and complete domains are given in terms of the ferric salt and corresponding acid concentrations which delineate regions of particle formation of given chemical composition and shape.
Abstract: The methods of preparation of ferric hydrous oxide sots consisting of particles, uniform in shape, of narrow size distribution are described in detail. To produce such sots, acidic solutions, containing ferric ions and nitrate, perchlorate, or chloride ions, respectively, were aged at elevated temperatures for times ranging from a few hours to a few weeks. Solids formed from the solutions containing chloride consisted of either β-FeOOH or α-Fe2O3 depending on the concentration of ferric and chloride ions, whereas particles generated in solutions containing nitrate or perchlorate ions consisted of α-Fe2O3. Particle shape varied greatly as the conditions of colloid preparation were altered. It was possible to produce systems consisting of cubic, ellipsoidal, pyramidal, rodlike, and spherical particles. Such dispersions differed greatly in color. Complete domains are given in terms of ferric salt and corresponding acid concentrations which delineate regions of particle formation of given chemical composition and shape. Electrokinetic measurements show relatively small difference in point of zero charge for the various sots studied.
724 citations
TL;DR: In this article, differential X-ray powder diffraction (DXRD) and extraction procedures were used to characterize the iron oxides present in four sediments from contrasting environments in the North Sea.
242 citations
TL;DR: X-ray absorption spectroscopy (XAS) was used to follow the evolution of local structural environments around ferric ions during the formation of ferric hydrous oxide gels from 1 M chloride and 0.1 M nitrate solutions as discussed by the authors.
193 citations
TL;DR: In this paper, a titrated iron(III) nitrate solution of varying concentration was titrated with base (NaOH) over a temperature range (24 to 90°C) by means of a homogeneous injection technique.
171 citations
TL;DR: In this paper, a thermodynamic model based on the supposition that phosphate concentrations in major rivers are controlled through equilibration with a solid-solution of amorphous ferric phosphate in amorphized ferric hydroxide is presented.
128 citations