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Relationship Among Derivative Spectroscopy, Color, Crystallite Dimensions, and Al Substitution of Synthetic Goethites and Hematites

Published online by Cambridge University Press:  02 April 2024

C. S. Kosmas ,
D. P. Franzmeier  and
D. G. Schulze
C. S. Kosmas*
Affiliation:
Agronomy Department, Purdue University, West Lafayette, Indiana 47907
D. P. Franzmeier
Affiliation:
Agronomy Department, Purdue University, West Lafayette, Indiana 47907
D. G. Schulze
Affiliation:
Agronomy Department, Purdue University, West Lafayette, Indiana 47907
*
2Present address: Athens Faculty of Agriculture, Laboratory of Soils and Agricultural Chemistry, Botanicos, 118 55, Athens, Greece.
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Abstract

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Nine hematites and 22 goethites were synthesized by a variety of methods to obtain monomineralic samples having a range of Al substitutions and particle sizes. The second derivative of absorbance and Munsell color designations were calculated from visible reflectance spectra obtained from the dry powders. Unit-cell dimensions, Al substitution, infrared band positions, mean crystallite dimensions (MCD) from X-ray powder diffraction, and particle size from fiber-optic Doppler anemometry (FODA) were determined. Previously reported correlations between Al substitution, goethite unit-cell dimensions, and OH-stretching and -bending band positions were confirmed. For hematite, the position of the second derivative peak at ∼600 nm was negatively correlated with Al substitution (r = −.86). Munsell value and chroma were positively correlated with Al substitution (r =.94 for both), but hue was not related to Al substitution. Hue appeared to become redder, however, as particle size measured either by FODA or MCD increased. For goethite, the position of the second derivative minimum at ∼485 nm was negatively correlated with Al substitution (r = −.99). Munsell hue appeared to be related to both Al substitution and MCD perpendicular to (110), MCD110, with hues becoming redder with increasing Al substitution and yellower with increasing MCD110. Correlations between Munsell value and chroma and parameters such as Al substitution, particle size, and OH-stretching and -bending band positions were poor, but goethites synthesized by oxidation of Fe2+ solutions at room temperature had higher chromas than goethites synthesized hydrothermally from an Fe3+ system. Visually determined colors agreed well with calculated ones. Second-derivative spectra and color designations calculated from visible spectra appear to be potentially useful for quickly estimating other properties of goethite and hematite, such as Al substitution and particle size.

Keywords

AluminumColorFiber-optic Doppler anemometryGoethiteHematiteVisible spectroscopy
Type
Research Article
Information
Clays and Clay Minerals , Volume 34 , Issue 6 , December 1986 , pp. 625 - 634
Copyright
Copyright © 1986, The Clay Minerals Society

Footnotes

1

Journal Paper No. 10,504.

References

Barron, V. and Torrent, J., 1984 Influence of aluminum substitution on the color of synthetic hematites Clays & Clay Minerals 32 157–158.CrossRefGoogle Scholar
Berkheiser, V. E. and Monsees, M. B., 1982 Dispersion of clays on graphite supports for X-ray microprobe analysis Soil Sci. Soc. Amer. J. 46 663–666.CrossRefGoogle Scholar
Bernas, B., 1968 A new method of decomposition and comprehensive analysis of silicate by atomic absorption spectroscopy Anal. Chem. 40 1682–1686.CrossRefGoogle Scholar
Bryant, R. B., Curi, N., Roth, C. B. and Franzmeier, D. P., 1983 Use of an internal standard with differential x-ray diffraction analysis for iron oxides Soil Sci. Soc. Amer. J. 47 168–173.CrossRefGoogle Scholar
Fischer, W. R. and Schwertmann, U., 1975 The formation of hematite from amorphous iron(III) hydroxide Clays & Clay Minerals 23 33–37.CrossRefGoogle Scholar
Goodman, B. A. and Lewis, D. G., 1981 Mössbauer spectra of aluminous goethites (α-FeOOH) J. Soil Sci. 32 351–363.CrossRefGoogle Scholar
Jónás, K. and Solymár, K., 1970 Preparation, x-ray derivatographic and infrared study of aluminum-substituted goethites Acta Chim. Acad. Sci. Hung. 66 383–394.Google Scholar
Klug, H. P. and Alexander, L. E., 1974 X-ray Diffraction Procedures for Polycrystalline and Amorphous Materials 2nd ed..Google Scholar
Kosmas, C. S. (1984) Visible spectra and color of synthetic Al-substituted goethites and hematites: Ph.D. thesis, Purdue Univ., West Lafayette, Indiana, 186 pp. (Diss. Abstr. Int. 45:1969-B).Google Scholar
Kosmas, C. S., Curi, N., Bryant, R. B. and Franzmeier, D. P., 1984 Characterization of iron oxide minerals by second derivative visible spectroscopy Soil Sci. Soc. Amer. J. 48 401–405.CrossRefGoogle Scholar
Lewis, D. G. and Schwertmann, U., 1979 The influence of aluminum on the formation of iron oxides. IV. The influence of Al, OH, and temperature Clays & Clay Minerals 27 195–200.CrossRefGoogle Scholar
Rendón, J. L. and Serna, C. J., 1981 IR spectra of powder hematite: effects of particle size and shape Clay Miner. 16 375–381.CrossRefGoogle Scholar
Ross, D. A., Dhadwal, H. S. and Dyott, R. B., 1978 The determination of the mean and standard deviation of the size distribution of a colloidal suspension of submicron particles using the fiber optic Doppler anemometer, FODA J. Colloid Interface Sci. 64 533–542.CrossRefGoogle Scholar
Savitzky, A. and Golay, M. J. E., 1964 Smoothing and differentiation of data by simplified least squares procedures Anal. Chem. 36 1627–1640.CrossRefGoogle Scholar
Schulze, D. G., 1984 The influence of aluminum on iron oxides, VIII. Unit-cell dimensions of Al-substituted goethites and estimation of Al from them Clays & Clay Minerals 32 36–44.CrossRefGoogle Scholar
Schulze, D. G. and Schwertmann, U., 1984 The influence of aluminium on iron oxides: X. Properties of Al-substituted goethites Clay Miner. 19 521–539.CrossRefGoogle Scholar
Schwertmann, U., 1964 Differenzierung der Eisenoxide des Bodens durch Extraktion mit Ammoniumoxalate-Lösung Z. Pflanzenernähr., Düng., Bodenkunde 105 194–202.CrossRefGoogle Scholar
Schwertmann, U., Fitzpatrick, R. W., Taylor, R. M. and Lewis, D. G., 1979 The influence of aluminum on iron oxides. Part II. Preparation and properties of Al-substituted hematites Clays & Clay Minerals 27 105–112.CrossRefGoogle Scholar
Sidhu, P. S., Gikes, R. J. and Posner, A. M., 1980 The behavior of Co, Ni, Zn, Mn and Cr in magnetite during alteration to maghemite and hematite Soil Sci. Soc. Amer. J. 44 135–138.CrossRefGoogle Scholar
Steinier, J., Termonia, Y. and Deltour, J., 1972 Comments on smoothing and differentiation of data by simplified least squares procedure Anal. Chem. 44 1906–1909.CrossRefGoogle Scholar
Thiel, R., 1963 Zum System αFeOOH-αAlOOH Z. Anorg. Allg. Chem. 326 70–78.CrossRefGoogle Scholar
Wu, Paul Pao-Lo (1983) Measurement of particle interactions in colloidal systems using a fiber optic Doppler anemometer (FODA) and viscometry: Ph.D. Thesis, Purdue Univ., West Lafayette, Indiana, 295 pp. (Diss. Abstr. Int. 44:3799-B).Google Scholar
Wyszecki, G. and Stiles, W. S., 1982 Color Science: Concepts and Methods, Quantitative Data and Formulae 2nd ed. New York Wiley.Google Scholar