Magnetic properties of composite materials based on plant- or mineral-derived amorphous silica

Fe x (O, OH) y –SiO 2 composite samples are prepared. The composite matrix is amorphous silica prepared by controlled precipitation from silicate solutions or silica derived from rice husks. The iron is shown to exist in the form of acagenite β-FeO(OH) or hematite α-Fe 2 O 3 . The magnetic propertie...

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Veröffentlicht in:	Russian journal of inorganic chemistry 2017-07, Vol.62 (7), p.971-975
Hauptverfasser:	Panasenko, A. E., Tkachenko, I. A., Kvach, A. A., Zemnukhova, L. A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Amorphous materials Chemical precipitation Chemistry Chemistry and Materials Science Composite materials Hematite Inorganic Chemistry Iron oxides Magnetic properties Magnetism Physical Methods of Investigation Silica Silicon dioxide
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Beschreibung
Zusammenfassung:	Fe x (O, OH) y –SiO 2 composite samples are prepared. The composite matrix is amorphous silica prepared by controlled precipitation from silicate solutions or silica derived from rice husks. The iron is shown to exist in the form of acagenite β-FeO(OH) or hematite α-Fe 2 O 3 . The magnetic properties of the composites are studied at temperatures in the range 2–300 K and fields in the range ±5 T. The composite samples exhibit superparamagnetic properties.
ISSN:	0036-0236 1531-8613
DOI:	10.1134/S0036023617070166