Quantitative analysis of anatase in Georgia kaolins using Raman spectroscopy

Schroeder, Paul A.; Melear, Nathan D.; Pruett, Robert J.

doi:10.1016/s0169-1317(03)00129-7

Cited by 36 publications

(18 citation statements)

References 19 publications

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“…A linear regression fit of the ν 1 peak positions to the measured MgCO 3 contents gives the following relationship:

mol % {MgCO}_{3} = \frac{ν_{1} - b}{m}

where the b (intercept) and m (slope) parameters of Eqn () are listed in Table . Proportional error based on Raman measurements gives the relationship

error mol % {MgCO}_{3} = ν_{1} \sqrt{{((), \frac{s_{m}}{m})}^{2} + {((), \frac{s_{b}}{b})}^{2}}

and values for s m and s b are tabulated in Table .…”

Section: Resultsmentioning

confidence: 99%

Raman spectroscopic characterization of the magnesium content in amorphous calcium carbonates

Wang

Hamm

Bodnar

et al. 2011

J Raman Spectroscopy

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A series of Mg‐bearing synthetic amorphous calcium carbonates (ACC) were characterized by Raman spectroscopy. The spectra showed a systematic increase in the carbonate ν1 peak position from the control samples that contained 0.0 mol % MgCO3 to samples that contained up to 43 mol % MgCO3. The relationship is best described by the function: mol % MgCO3 = (ν1 – 1079.66) / 0.2017. The Mg content is equally well‐predicted by a correlation with the instrumentally corrected ν1 full width at half maximum that is quantified by: mol % MgCO3 = (ν1 – 23.26) / 0.1969. An analysis of the Raman data collected for ACC combined with insights from crystalline materials suggests that compositional dependencies arise from changes in the local metal–oxygen bonds as Mg substitutes for Ca. The calibrations described here provide a rapid and nondestructive means of determining the Mg content of ACC, with additional advantages of minimal sample preparation and a high degree of lateral spatial resolution (approximately 1 µm). This method may be appropriate for investigations of heterogeneous samples such as biominerals. Copyright © 2011 John Wiley & Sons, Ltd.

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“…A linear regression fit of the ν 1 peak positions to the measured MgCO 3 contents gives the following relationship:

mol % {MgCO}_{3} = \frac{ν_{1} - b}{m}

where the b (intercept) and m (slope) parameters of Eqn () are listed in Table . Proportional error based on Raman measurements gives the relationship

error mol % {MgCO}_{3} = ν_{1} \sqrt{{((), \frac{s_{m}}{m})}^{2} + {((), \frac{s_{b}}{b})}^{2}}

and values for s m and s b are tabulated in Table .…”

Section: Resultsmentioning

confidence: 99%

Raman spectroscopic characterization of the magnesium content in amorphous calcium carbonates

Wang

Hamm

Bodnar

et al. 2011

J Raman Spectroscopy

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“…3a,b) (Ohsaka et al, 1978;Griffith, 1987;Best et al, 1992;Murad, 1997;Murad and Köster, 1999;Schroeder et al, 2003). There is also a small amount of rutile in each white slip sample, as made evident by the presence of characteristic Raman bands (Fig.…”

Section: White Slipmentioning

confidence: 90%

“…The extraordinarily intense Raman spectra obtainable from even trace amounts of anatase in kaolinite were first recognised by Murad (1997) and Murad and Köster (1999) and quantified by Schroeder et al (2003). This contrasts with the known weak Raman scattering by the bulk component, kaolinite.…”

Section: Introductionmentioning

confidence: 99%

Can the Raman spectrum of anatase in artwork and archaeology be used for dating purposes? Identification by Raman microscopy of anatase in decorative coatings on Neolithic (Yangshao) pottery from Henan, China

Clark

Wang

Correia

2007

Journal of Archaeological Science

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“…Likewise, the anatase found in kaolin clays (Figure 4) contains ~95% titanium and ~5% iron, according to Paul Schroeder, an associate professor of geology at the University of Georgia (12). And Weaver says that Cahill's elemental analysis of the map's ink is consistent with the possibility that it was formulated with anatase-containing clay.…”

Section: Giving the Ink "Bite"mentioning

confidence: 99%

Vinland: An Inky Controversy Lives

Graham¹

2004

Anal. Chem.

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A small but determined group of researchers again argues that the Vinland map is authentic.The 47-year-old controversy isn't going away. AN INKY CONTROVERSY LIVESS ince the Vinland map suddenly and mysteriously turned up in a Geneva bookstore in 1957, its faded lines have placed analytical chemists at the center of a raging debate over the authenticity of one of American history's most intriguing documents. The drawing on an approximately 550-year-old parchment shows a large island in the western Atlantic in the general location of Canada, described on the map as "even having vines" and hence named Vinland. If authentic, the map would be the earliest known cartographic representation of America.Many analytical chemists are convinced the map is a fraud. But like an extinguished forest fire that flames anew with each fresh wind, the controversy rekindles itself-most recently in four letters in this journal (1-4). The map was also the subject of a talk at the American Chemical Society's national meeting in August 2004. The linchpin in the skeptics' case is Walter McCrone's conclusion that anatase (TiO 2 ) particles taken from the map could only have originated after 1917, from a commercially produced pigment (5 ). McCrone, a distinguished chem-

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Quantitative analysis of anatase in Georgia kaolins using Raman spectroscopy

Cited by 36 publications

References 19 publications

Raman spectroscopic characterization of the magnesium content in amorphous calcium carbonates

Raman spectroscopic characterization of the magnesium content in amorphous calcium carbonates

Can the Raman spectrum of anatase in artwork and archaeology be used for dating purposes? Identification by Raman microscopy of anatase in decorative coatings on Neolithic (Yangshao) pottery from Henan, China

Vinland: An Inky Controversy Lives

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