A Mössbauer approach to the physico-chemical characterization of iron-containing pigments for historical wall paintings

Casellato, U.; Vigato, P.A.; Russo, Umberto; Matteini, M

doi:10.1016/s1296-2074(00)01088-8

Cited by 24 publications

(7 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Nevertheless, structural studies of ochres are numerous, mostly applied to pure goethite, pure hematite and to the dehydration of goethite to hematite, especially in prehistoric paintings. They call upon various techniques like Mössbauer effect [6,7], thermal analysis [8], FT-IR spectroscopy [9][10][11][12], X-ray diffraction [4,[8][9][10][11][13][14][15], Raman microscopy [12,15] and magnetic and voltamperemetric analyses [16]. Seven experimental techniques are used in this study.…”

Section: Introductionmentioning

confidence: 99%

The colour of ochres explained by their composition

Elias

Chartier

Prévot

et al. 2006

Materials Science and Engineering: B

149

111

View full text Add to dashboard Cite

International audienceThe first purpose of this paper is to underline a relevant colorimetric co-ordinate characterizing the colour of ochres within their extremely wide range, from pale yellow to dark red. The second purpose is to link together quantitatively the variations of this colorimetric co-ordinate and the various chemical compositions of the samples, mainly hematite, goethite and white pigments. A group of 30 modern ochres and a group of 20 ancient ochres have been investigated. All these natural pigments have been commercialized. Diffuse reflectance spectrometry allows to calculate the colorimetric co-ordinates in the CIE-L*a*b* space and the position of the absorption band of each sample. Physico-chemical analysis has been obtained by quantitative X-ray diffraction, scanning and transmitting electronic microscopy and particle-size analysis by laser diffraction. The positive a* co-ordinate (redness) has been underlined, for the first time, to be the only relevant colorimetric parameter to characterize the colour of the ochres. Its variations are quantitatively connected to the shift of the absorption band due to the charge transfer between the ligand (OH− or O2−) and the Fe3+ ion contained in goethite and/or hematite. For ochres containing both hematite and goethite, the a* co-ordinate linearly increases with the relative amount of hematite while the absorption band progressively shifts towards the high wavelengths. Such a linear shift of the absorption band has never been underlined before. For ochres containing only one iron oxide, a* linearly decreases with the amount of white pigments, whatever the nature of the white charges. Moreover, this study gives the opportunity to show that only the nature, the amount and the size distribution of the white charges allow to discriminate the ochres according to their geographic origin

show abstract

Section: Introductionmentioning

confidence: 99%

The colour of ochres explained by their composition

Elias

Chartier

Prévot

et al. 2006

Materials Science and Engineering: B

149

111

View full text Add to dashboard Cite

show abstract

“…Mössbauer spectroscopy can be used to study iron-containing pigments in paintings [Arbizzani et al, 2004;Casellato et al, 2000;Keisch, 1976]. Since the colour of pigments often depends upon the particle size and size is reflected in the Mössbauer spectra, this approach may yield more information on pigments than XRD.…”

Section: Paintingsmentioning

confidence: 99%

Molecular Spectroscopy

2007

Analytical Techniques in Materials Conservation

View full text Add to dashboard Cite

“…XRD has been widely used to identify inorganic pigments used in paintings [Ajo et al, 2004;Casellato et al, 2000;Creagh, 2005;Hochleitner et al, 2003;Mazzocchin et al, 2003aMazzocchin et al, , 2004O'Neill et al, 2004;Schreiner et al, 2004]. This technique is particularly useful for differentiating pigments of the same chemical structure but with different crystalline phases.…”

Section: Paintingsmentioning

confidence: 99%

X‐Ray Techniques

Stuart

2007

Analytical Techniques in Materials Conservation

View full text Add to dashboard Cite

X-rays are an electromagnetic radiation with wavelengths of the order of 10 −10 m. They are typically generated via the bombardment of a metal with high energy electrons. The manner in which X-ray radiation interacts with or is emitted by matter has been exploited in a number of experimental techniques that are widely employed for the structural and compositional analysis of materials of cultural importance. X-ray diffraction (XRD) exploits the fact that the wavelengths of X-rays are comparable to the spacing between regularly spaced atoms. This enables diffraction patterns to be formed and the compounds present to be identified. In X-ray fluorescence (XRF), a beam of X-rays are used to ionise atoms in a material of interest. The characteristic radiation that is emitted provides information about the type and amount of the elements present in a sample. Electron microprobe analysis can be used for analysis of elements as well. The emission of X-rays induced by the use of high energy ion beams can also be examined in techniques such as proton induced X-ray emission (PIXE). As with XRF, qualitative and quantitative analysis can be carried out. The energy of X-rays is also exploited in X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES). In XPS, the energy of the incident radiation causes electrons to be ejected from the inner cores of atoms. In AES, the emission of a second electron occurs after high energy radiation has expelled another. As the energies released are characteristic of the elements present, these techniques can be used to identify elements in a material of interest.

show abstract

A Mössbauer approach to the physico-chemical characterization of iron-containing pigments for historical wall paintings

Cited by 24 publications

References 2 publications

The colour of ochres explained by their composition

The colour of ochres explained by their composition

Molecular Spectroscopy

X‐Ray Techniques

Contact Info

Product

Resources

About