Über eine neue, ferromagnetische Modifikation des Eisen(III)oxyds

Glemser, O.; Gwinner, E.

doi:10.1007/bf01774145

Cited by 3 publications

(5 citation statements)

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“…Total carbon was determined with a carmograph (Wrsthoff Company, Essen). In natural samples total oxidic Fe was extracted by dithionite-citrate-bicarbonate (Fed) (Mehra and Jackson, 1960) and in synthetic samples by concentrated HCI (Fet). All samples were also extracted by oxalate in the dark (Feu) (Schwertmann, 1964).…”

Section: Methodsmentioning

confidence: 99%

“…Synthetic ~i-FeOOH has usually been prepared by the oxidation of Fe(OH)2 (Glemser and Gwinner, 1939;Feitknecht et al, 1969;Povitskii et al, 1976) or from soluble Fe(II) hydroxy complexes (Misawa et al, 1970). This involves a rather high pH rarely occurring in nature.…”

Section: Genesismentioning

confidence: 99%

“…On the basis of electron diffraction studies the structure of feroxyhite was found to be related to the ferromagnetic 8-FeOOH (Glemser and Gwinner, 1939;Bernal et al, 1959;Dasgupta, 1961) but in contrast to 8-FeOOH it showed only the 4 strongest lines and was not ferromagnetic. Similar material was obtained synthetically and called 8'-FeOOH.…”

Section: Introductionmentioning

confidence: 99%

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Natural Occurrence of Feroxyhite (δ′-FeOOH)

Carlson

Schwertmann

1980

Clays and Clay Minerals

101

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Abstraet--Feroxyhite (~'-FeOOH) in association with goethite and lepidocrocite was found as a dominant mineral in some rusty precipitates from Finland. These precipitates formed in the interstices of sand grains from rapidly flowing, Fe(II)-containing water which was very quickly oxidized as it flowed through the sediment. The mineral is distinguished from other FeOOH forms and from ferrihydrite mainly by its X-ray powder diffractogram. Further characteristics are an acicular morphology (possibly thin, rolled plates), an internal magnetic field at 4~ of -510 kOe, Fe-OH stretching bands at -2900 cm 1 and Fe-OH bending bands at 1110, 920, 790, and 670 cm -1, and an oxalate solubility between ferrihydrite and goethite or lepidocrocite. Feroxyhites with very similar properties were synthesized by oxidation of an Fe(II) solution with HzO 2 at a pH between 5 and 8.

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Section: Methodsmentioning

confidence: 99%

Section: Genesismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Natural Occurrence of Feroxyhite (δ′-FeOOH)

Carlson

Schwertmann

1980

Clays and Clay Minerals

101

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“…The 6 polymorph ~ is the only ferric hydroxide to exhibit a significant magnetization at room temperature (Glemser and Gwinner 1939;Francombe and Rooksby 1959). The crystallographic structure of 6-FeOOH was studied by Francombe and Rooksby (1959), Krakow et al (1980), Patrat et al (1983) and most recently by Drits et al (1993a).…”

Section: Introductionmentioning

confidence: 98%

Magnetic properties of feroxyhyte (?-FeOOH)

et al. 1995

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Abstract. Magnetization curves and high-field M6ss-bauer spectra are used to deduce a model for the magnetic order in synthetic samples of 6-FeOOH (feroxyhyte), which takes account of the changes in magnetization when the samples are heated at 105 ~ Feroxyhyte is essentially a planar antiferromagnet with the net sublattice moments aligned parallel or antiparallel to c. Each particle acquires a net moment due to the very small number of layers along the c-direction, and the presence of surface steps causing the formation of ferrimagnetic domains with an odd number of layers. There is some spin canting which is related to the crystallinity of the sample. The decrease in magnetization following heating is mainly due to an increase in the extent of antiferromagnetic coupling between the closely packed ferrimagnetic particles, but changes in the spin canting within the bulk may also contribute. A typical, rather well crystallized specimen has magnetization a = 14 JT-1 kg-1 and Curie temperature T~ = 455 K.

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“…These include nanosheets obtained through a chemical transformation process by oxidizing ultrathin Fe(OH) 2 nanosheets [41], nano-disks produced via γ-irradiation of iron(III) aqueous colloidal solutions [42], nano-particles synthesized through precipitation of Fe 2+ solutions with sodium hydroxide [27], spherical nano-particles obtained by hydrazine reduction [43], nanoparticles produced by rapid oxidation of iron(II) hydroxide using hydrogen peroxide (H 2 O 2 ) [17]. In addition to these methods, δ-FeOOH nanoparticles have also been synthesized through precipitating Fe(OH) 2 followed by fast oxidation with H 2 O 2 [21,44,45], and through traditional methods [46,47].…”

Section: Introductionmentioning

confidence: 99%

Photovoltaic amorphous feroxyhyte nanostructures synthesized by atmospheric AC microplasma

Shamaki,

Benjamin Ogueri,

Alomary

et al. 2023

Nanotechnology

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Feroxyhite (δ-FeOOH) nanomaterials were successfully synthesized through the atmospheric AC microplasma method at room temperature from ferrous sulfate aqueous solutions. Various syntheses conditions, including electric voltage, electric ﬁeld strength, ferrous concentration, H2O2 concentration, and reaction duration, were systematically investigated. The synthesized products were characterized through X-ray diﬀraction, UV-vis absorption spectroscopy, photoluminescence spectroscopy, infra-red spectroscopy, and electron microscopy. The bandgap of the produced materials were strongly dependent of the ferrous concentration while the product ratio was dependent on all experimental conditions. The synthesis mechanism was thoroughly discussed. The synthesized nanomaterials were amorphous nanospheres,

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Über eine neue, ferromagnetische Modifikation des Eisen(III)oxyds

Cited by 3 publications

References 0 publications

Natural Occurrence of Feroxyhite (δ′-FeOOH)

Natural Occurrence of Feroxyhite (δ′-FeOOH)

Magnetic properties of feroxyhyte (?-FeOOH)

Photovoltaic amorphous feroxyhyte nanostructures synthesized by atmospheric AC microplasma

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