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Mineralogical, Chemical, and Physical Characterization of Synthetic Al-Substituted Maghemites (γ−Fe2−xAlxO3)

Published online by Cambridge University Press:  01 January 2024

Marcelo A. Batista ,
Antonio C. S. da Costa ,
Jerry M. Bigham ,
Henrique de Santana ,
Dimas A. M. Zaia  and
Ivan G. de Souza junior
Marcelo A. Batista*
Affiliation:
Universidade Estadual de Maringá, UEM, Departamento de Agronomia, Av. Colombo 5790, 87020-900, Maringá, PR, Brazil
Antonio C. S. da Costa
Affiliation:
Universidade Estadual de Maringá, UEM, Departamento de Agronomia, Av. Colombo 5790, 87020-900, Maringá, PR, Brazil
Jerry M. Bigham
Affiliation:
The Ohio State University, School of Environment and Natural Resources, 2021 Coffey Road, 210 Kottman Hall, 43210-1085 Columbus, OH, USA
Henrique de Santana
Affiliation:
Universidade Estadual de Londrina, UEL, Departamento de Quèmica, 86051-990, Londrina, PR, Brazil
Dimas A. M. Zaia
Affiliation:
Universidade Estadual de Londrina, UEL, Departamento de Quèmica, 86051-990, Londrina, PR, Brazil
Ivan G. de Souza junior
Affiliation:
Universidade Estadual de Maringá, UEM, Departamento de Agronomia, Av. Colombo 5790, 87020-900, Maringá, PR, Brazil
*
* E-mail address of corresponding author: batistamar@hotmail.com
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Abstract

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Maghemite (γ-Fe2O3) is a ferrimagnetic Fe oxide commonly found in tropical and subtropical soils, especially in the topsoil where it is usually a product of burning. Isomorphic substitution (IS) of the Fe in maghemite by different metals (mainly Al3+) can modify its mineralogical and chemical attributes, and these modifications may be important to understanding the formation and properties of this mineral in soils and sediments. The objective of this work was to evaluate the crystallochemical alterations of synthetic, Al-substituted maghemites prepared by the precipitation of magnetites from alkaline aqueous media containing FeSO4·7H2O with increasing amounts of Al2(SO4)3·7H2O to obtain hypothetical Al3+ for Fe3+ substitutions ranging from 0.0 to 40.0 mol %. The Al-substituted magnetites were washed and dried, and then heated to 250ºC for 4 h to form yellowish red maghemites that were characterized by total chemical analysis, X-ray diffraction, specific surface area (SSA), mass-specific magnetic susceptibility, infrared spectroscopy, transmission electronic microscopy, and color. Increasing Al3+ substitution to an experimental maximum of 15.9 mol % decreased both the a0 dimension of the cubic unit cell (a0 = 0.8339 − 396.157 × 10−16 Al, r2 = 0.99) and the mean crystallite dimension (MCD = 76.4–3.15Al, r2 = 0.79) of the maghemites. With the decrease in MCD came a more yellowish color, an increase in SSA, and a decrease in crystallinity as measured through extraction of the samples with acid ammonium oxalate. The mass-specific magnetic susceptibility of the maghemites increased with Al3+ substitution up to 5.3 mol % and then decreased with further replacement of Fe by Al. Solid-phase aluminum in excess of 16 mol % substitution appeared to occur as a separate, poorly crystalline phase that was X-ray amorphous.

Keywords

Fe OxidesIsomorphic SubstitutionMass Specific Magnetic SusceptibilitySpecific Surface AreaX-ray Diffraction
Type
Article
Information
Clays and Clay Minerals , Volume 58 , Issue 4 , August 2010 , pp. 451 - 461
Copyright
Copyright © The Clay Minerals Society 2010

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