Mössbauer Spectroscopic Study of a Mural Painting from Morgadal Grande, Mexico

Kuno, Akihiro; Matsuo, Mitsuhiro; Soto, Arturo Pascual; Tsukamoto, Kenichiro

doi:10.1023/b:hype.0000043264.62906.6b

Cited by 5 publications

(1 citation statement)

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“…[9]) is very likely due to the isomorphic replacement of iron by aluminum in the crystallographic structure and to the very small particle sizes of soil iron oxides [10]. The two central doublet (RA = 44 %) may be assigned to some (super)paramagnetic ferric components [11,12]. The hyperfine parameters for these Fe 3+ sites are compatible with those of iron in silicates or other soil mineral with low-content isomorphically replacing iron, although any eventual contribution of superparamagnetic iron oxides of extremely fine particles cannot be discarded.…”

Section: Resultsmentioning

confidence: 99%

Iron-containing pigment from an archaeological rupestrian painting of the Planalto Tradition in Minas Gerais, Brazil

Floresta

Fagundes

Fabris³

et al. 2015

Hyperfine Interact

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Archaeological rupestrian arts of the Planalto Tradition are of relatively widespread occurrence all over the land area of the state of Minas Gerais (MG), Brazil. They are typically composed by monochromic zoomorphic figures, especially of cervids, mainly in red or orange color. A fragment of a rock wall containing an archaeological painting was collected at the Itanguá site, in the municipality of Senador Modestino Gonçalves (geographical coordinates, 17 • 56 51 S 43 • 13 22 W), MG. The rock piece was covered with an archaeological painting with pigments of two different hues of red. The X-ray fluorescence (XRF) analysis revealed only a slight difference in Fe and P content for the two different color zones. The pigment materials on this small fragment of rock were analyzed by X-ray diffraction on the conventional incidence mode (XRD) and on grazing incidence X-ray mode (GIXRD), scanning electron microscopy with energy dispersive x-ray detector (SEM/EDS) and conversion electron Mössbauer spectroscopy (CEMS) at room temperature. Results indicated the occurrence of mainly hematite but also of diopside in the pigment. CEMS at RT reveal the presence of hematite and (super)paramagnetic ferric components. In order to confirm these results a small amount of powder from the painting pigments was also analyzed by transmission Mössbauer spectroscopy at 20 K.

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Section: Resultsmentioning

confidence: 99%

Iron-containing pigment from an archaeological rupestrian painting of the Planalto Tradition in Minas Gerais, Brazil

Floresta

Fagundes

Fabris³

et al. 2015

Hyperfine Interact

View full text Add to dashboard Cite

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Mössbauer Spectroscopy

Yang

2009

Digital Encyclopedia of Applied Physics

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Mössbauer spectroscopy is a unique technique based on nuclear resonance via recoil‐free emission, absorption, and scattering of γ‐rays. Because of its extremely high energy resolution and its particular timescale, a Mössbauer spectrum can provide valuable information on structural, chemical, magnetic, and dynamical properties of a variety of solid materials. Mössbauer spectroscopy finds applications in various fields of scientific research, such as physics, metallurgy, materials science, chemistry, mineralogy, biology, medicine, environmental science, archeology, and art. Mössbauer effect has been observed in about 100 isotopes. 57 Fe is by far the most important one, followed by 119 Sn. A typical Mössbauer spectrometer operates in the transmission geometry where the γ‐rays emitted from the source and modulated via Doppler effect are resonantly absorbed in a solid sample. The amount of transmitted γ‐rays is recorded and analyzed as a function of γ‐photon energy, resulting in a Mössbauer spectrum. The shape, location, and intensity of the absorption peaks in a Mössbauer spectrum can reveal hyperfine interactions between the Mössbauer isotope and its surroundings, and therefore provide information on the chemical, magnetic, and structural properties of the material under investigation. The emission, absorption, and scattering of γ‐rays may also involve the creation or annihilation of phonons. This process is intricately related to lattice dynamics and strongly dependent on temperature. Therefore, Mössbauer spectroscopy can be used for studying lattice vibrations and phonon density of states, as well as their dependence on temperature, pressure, crystallinity, impurity, and so on. As synchrotron radiation became available, new elastic and inelastic scattering methods have been developed. The emergence of time‐domain Mössbauer spectroscopy has provided not only evidence for the coherent decay of nuclear excitons but also a new methodology for extracting parameters of hyperfine interactions and lattice dynamics.

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