Spectrochemical and structural studies on a roman sample of Egyptian blue

Mirti, Piero; Appolonia, Lorenzo; Casoli, Antonella; Ferrari, Rosa Pia; Laurenti, Enzo; Canesi, A. Amisano; Chiari, Giacomo

doi:10.1016/0584-8539(94)e0108-m

Cited by 74 publications

(61 citation statements)

References 9 publications

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“…The ranges of the measured values of g || = 2.32-2.34 and g ⊥ = 2.055-2.060 are consistent with a ligand field either in octahedral or in square planar geometry [16,17]. These features are in agreement with the EPR characterisation of an ancient EB sample carried out by Mirti et al [15], where a square planar geometry of the ligand field was stated. The high values (≈4) of the parameter G = (g || − 2)/(g ⊥ − 2), according to the model by Procter et al [18,19], should suggest an octahedral geometry, but this is not relevant for the aims of the present work.…”

Section: Epr Spectral Patternsupporting

confidence: 85%

“…1). This is in agreement with the presence of a unique copper(II) paramagnetic species, with an unpaired electron in the d 9 orbital and in the B 1g ground state of an apparent D 4h axial ligand field geometry [15]. The spectra appear totally unresolved in their hyperfine components, because of the strong spin-spin interaction due to the very high Cu 2+ density.…”

Section: Epr Spectral Patternsupporting

confidence: 82%

“…Some of the studied samples showed some differences in the EPR line shapes, not in agreement with the typical one for this kind of geometry [15][16][17]. We hypothesised the presence of some signal superimposed to the one described above for Cu 2+ ion in EB, since both the theoretical assessment and the simulation attempts did not give satisfactory results.…”

Section: Spurious Spectramentioning

confidence: 86%

“…Moreover, to the best of our knowledge, there is only one paper dealing with an EPR study of an EB sample, and just as a part of an investigation using different spectroscopic techniques [15].…”

Section: Egyptian Bluementioning

confidence: 99%

“…EPR spectra were recorded at room temperature, since the comparison with a reference spectrum of EB [15] taken at 77 • K did not show any relevant differences in the line shape and resolution. We used a Bruker E 200D X-band spectrometer equipped with a TE 102 microwave resonant cavity.…”

Section: Electron Paramagnetic Resonance (Epr)mentioning

confidence: 99%

See 4 more Smart Citations

An EPR study on ancient and newly synthesised Egyptian blue

Orsega

Agnoli

Mazzocchin

2006

Talanta

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Two sets of ancient roman Egyptian blue (EB) samples and one set of EB samples synthesised in our lab, were analysed by EPR spectroscopy, a technique not commonly used in this field. The spectroscopic parameters obtained were used to attempt the discrimination of the provenance and of the manufacturing techniques of the investigated samples.The results obtained show that EPR technique could be very useful for this purpose. Furthermore, the similarity of the obtained parameters between the ancient and new samples testify the successful attempt to reproduce the EB according to the chemical knowledge.

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Section: Epr Spectral Patternsupporting

confidence: 85%

Section: Epr Spectral Patternsupporting

confidence: 82%

Section: Spurious Spectramentioning

confidence: 86%

Section: Egyptian Bluementioning

confidence: 99%

Section: Electron Paramagnetic Resonance (Epr)mentioning

confidence: 99%

See 3 more Smart Citations

An EPR study on ancient and newly synthesised Egyptian blue

Orsega

Agnoli

Mazzocchin

2006

Talanta

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Vibrational Spectroscopy for the Analysis of Geological and Inorganic Materials

Busca

Resini

2000

Encyclopedia of Analytical Chemistry

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The vibrational spectroscopies are those producing the entire (or part) vibrational spectrum of a sample, i.e. the collection of transition energies between its vibrational states. The simplest way to cause vibrational excitation is to allow the chemical species in its vibrational ground state to absorb an energy quantum from electromagnetic radiation of an appropriate energy, i.e. in the medium infrared (IR) or in the far infrared (FIR) regions. Transmission–absorption IR spectroscopy comprises the analysis of the quanta that are actually absorbed by a polyatomic chemical species and those that are not absorbed (so are transmitted). Other IR techniques relate to the analysis of the radiation that is emitted, diffused, or reflected by the sample. Another way to obtain part or all of the vibrational spectrum of a chemical species is to look at the inelastic scattering of beams other than IR radiation. Raman spectrometry is the analysis of the ultraviolet (UV), visible or near infrared (NIR) radiation that is scattered inelastically by the sample. Inelastic neutron scattering (INS) is the analysis of the energy of formerly monochromatic neutron beams after inelastic scattering by the sample. Analyses of the number and energies of the vibrational transitions of the sample, detected by each technique, yield information on the geometric (molecular and crystallographic) structure of the sample and on the strength and nature of the chemical bonds it contains.

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Photoluminescence of Egyptian Blue

Chiari

2018

The Encyclopedia of Archaeological Sciences

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Visible induced luminescence (VIL) is a powerful imaging technique applicable mostly to Egyptian Blue (EB hereafter). It is based on the ability of EB to absorb visible light and luminesce in the near‐infrared region. Han Blue Han Purple and some cadmium‐based pigments also luminesce, although with much lower intensity. The basic tools needed for the imaging are a digital camera with the IR filter removed, and a source of visible light without an IR component. The environmental IR noise needs to be reduced to a minimum. Many different variations of this basic setting have been proposed, from LEDs to flash with IR cutting filters. The presence of EB traces, even small, on works of art is a strong indication of their authenticity, since it is believed that the EB manufacturing technique was lost with the fall of the Roman Empire, although exceptions have been found. Using VIL, some information can be gathered on the EB history.

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Spectrochemical and structural studies on a roman sample of Egyptian blue

Cited by 74 publications

References 9 publications

An EPR study on ancient and newly synthesised Egyptian blue

An EPR study on ancient and newly synthesised Egyptian blue

Vibrational Spectroscopy for the Analysis of Geological and Inorganic Materials

Photoluminescence of Egyptian Blue

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