Germanium mullite: Structure and vibrational spectra of gels, glasses and ceramics

Michel, D.; Colomban, Philippe; Abolhassani, S.; Voyron, F.; Kahn-Harai, A.

doi:10.1016/0955-2219(95)00145-x

Cited by 41 publications

(37 citation statements)

References 14 publications

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“…For instance, Fig. 10a compares the Raman spectrum of a 2GeO 2 eAl 2 O 3 e2H 2 O gel prepared through alkoxides hydrolysisepolycondensation with those of the phases obtained after thermal treatment up to 1450 C [298]. The intermediate Al 2 Ge 2 O 7 phase (stable from 1250 to 1300 C) has a low symmetry monoclinic structure but fine low frequency Raman peaks, characteristic of an ordered compound, while the bands of crystalline mullite are as broad as those of the glass in spite of a higher symmetry orthorhombic structure.…”

Section: The Structural Variety Of Glass Ceramicsmentioning

confidence: 99%

Raman Spectroscopy of nanomaterials: How spectra relate to disorder, particle size and mechanical properties

Gouadec

Colomban

2007

Progress in Crystal Growth and Characterization of Materials

943

724

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The purpose of this review is to provide non-specialists with a basic understanding of the information micro-Raman Spectroscopy (mRS) may yield when this characterization tool is applied to nanomaterials, a generic term for describing nano-sized crystals and bulk homogeneous materials with a structural disorder at the nanoscale e typically nanoceramics, nanocomposites, glassy materials and relaxor ferroelectrics. The selected materials include advanced and ancient ceramics, semiconductors and polymers developed in the form of dots, wires, films, fibres or composites for applications in the energy, electronic and aeronauticseaerospace industries. The text is divided into five sections:

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Section: The Structural Variety Of Glass Ceramicsmentioning

confidence: 99%

Raman Spectroscopy of nanomaterials: How spectra relate to disorder, particle size and mechanical properties

Gouadec

Colomban

2007

Progress in Crystal Growth and Characterization of Materials

943

724

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“…In many places we obtain a broadband fingerprint, as observed for crystalline mullite and/or mullite-like glassy aluminosilicate. 11,46 Differences between the PDA and PDN spectra are not straightforward: On the one hand, the PDA body exhibits in some places a very strong˛-quartz peak (463 cm 1 ), which indicates that some quartz grains remain undissolved and that the phase is homogeneously dispersed in the body. Note that this phase is usually not observed by x-ray diffraction.…”

Section: Observed Crystalline Phasesmentioning

confidence: 99%

Identification and differentiation of ancient and modern European porcelains by Raman macro‐ and micro‐spectroscopy†

Colomban

Treppoz

2001

J Raman Spectroscopy

166

121

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Selected porcelain representative of the different production technologies used from the eighteenth to the twentieth century at the French Royal Manufacture, which became The Imperial Manufacture and now the Manufacture Nationale de Sèvres, were studied by non-destructive Raman macro-and/or microspectroscopy: French soft paste ('pâte tendre'or 'frit ware'), English-like (bone China), the latest soft pastes made from glass (silica-rich soft paste, Vögt soft paste), and ancient hard (PDA) and new hard (PDN) pastes. Analyses were made directly on the glazed and unglazed regions of the bodies. The presence of a strong b-wollastonite and/or tricalcium phosphate peak makes it easy to differentiate a soft-paste body from a hard-paste body on Raman spectra. The different components of the spectra also allow the identification of the different types of glaze (with stannic, lead or boron oxide or feldspars as the main fluxing materials). Numerical analysis (2D correlation method) was applied to identify the glaze and highlight the relationship between different samples.

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“…1400 BC) through to the fine European and Chinese porcelains of the fifteenth to nineteenth centuries. The range of materials investigated includes tin-glazed earthenwares, mediaeval terracotta roof tiles, majolica and bone Chinas from which it has been possible to deduce the salient features of the ceramic bodies, glazes and the applied pigments where appropriate [3][4][5][6][7]. The non-destructive analysis of ceramics poses several challenges for spectroscopists because of their composite nature, where the sintered grain and domain sizes range from a few microns to about 500 μ, the presence of crystalline and glassy phases along with unreacted starting components, and the inhomogeneity of the ceramic matrices arising from diverse processing technologies, firing sequences and kiln temperatures.…”

Section: Introductionmentioning

confidence: 99%

Porcelain shards from Portuguese wrecks: Raman spectroscopic analysis of marine archaeological ceramics

et al. 2017

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Raman spectroscopic analysis of shards recovered from two Portuguese shipwrecks, the Santo Espirito (1608) and the Santa Maria Madre de Deus (1643), believed to be carrying porcelains of the Ming period have revealed some interesting and novel results that inform historical ideas of porcelain production. The porcelain body of two of the four shards from the Santa Maria Madre de Deus were found to contain anatase, a low temperature polymorph of titanium dioxide, and β-wollastonite a mineral characteristic of soft-paste porcelains that are made at medium-temperature firing conditions. Previously, β-wollastonite has been found in a range of sixteenth to nineteenth century European porcelains but this is the first report of its detection in porcelain believed to be from the Ming period. These same shards exhibited unusual spectral features that were attributed to the resonance enhancement of rare earth elements that resulted from excitation using a near-infrared source.

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Germanium mullite: Structure and vibrational spectra of gels, glasses and ceramics

Cited by 41 publications

References 14 publications

Raman Spectroscopy of nanomaterials: How spectra relate to disorder, particle size and mechanical properties

Raman Spectroscopy of nanomaterials: How spectra relate to disorder, particle size and mechanical properties

Identification and differentiation of ancient and modern European porcelains by Raman macro‐ and micro‐spectroscopy†

Porcelain shards from Portuguese wrecks: Raman spectroscopic analysis of marine archaeological ceramics

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