Papers by Patrice Lehuédé
Weathering phenomena (blooming, iridescence) occurring on the inner surface of pristine, unfilled... more Weathering phenomena (blooming, iridescence) occurring on the inner surface of pristine, unfilled soda―lime―silica glass containers during storage are examined using surface analytical techniques and chemical analysis. The weathering pattern includes diffuse leaching accompanied by neocrystallisations indicating reactions of the glass with the environmental components. An explanation of the weathering pattern and a mechanism of deterioration is proposed. The significant differences seen with this type of weathering compared with that of soda-lime-silica float glass exposed outdoors in a polluted urban environment are also discussed.
Glass science and …, 2001
... 2) ; LEHUEDE Patrice (3) ; RÄDLEIN Edda (4) ; TADOKORO Nobuyuki (5) ; MAZZOLDI Paolo (6) ; RI... more ... 2) ; LEHUEDE Patrice (3) ; RÄDLEIN Edda (4) ; TADOKORO Nobuyuki (5) ; MAZZOLDI Paolo (6) ; RIGATO Valentino (7) ; MATSUMOTO ... means of SIMS (secondary ion mass spectrometry), SNMS (secondary neutral mass spectrometry), XPS (X-ray photoelectron spectroscopy ...
The film thicknesses of five different layer systems on glass substrates were analyzed and determ... more The film thicknesses of five different layer systems on glass substrates were analyzed and determined in a multi-method approach by eight different university and industrial laboratories. The total coating thicknesses varied between a few nm up to some 100 nm. The measurements give information about the chemical composition and cover a wide spectrum of typical coating application on glasses. The results of the different laboratories and methods are compared and the challenges and limits of the various analytical techniques are discussed.
Glass Technology, 1990
Presentation des resultats obtenus avec differentes techniques physiques d'analyse de surface... more Presentation des resultats obtenus avec differentes techniques physiques d'analyse de surface afin de comparer les performances de ces methodes et de montrer leur complementarite
Minerals, 2020
This work aimed to investigate the origin of different red hues of Roman copper-based red opaque ... more This work aimed to investigate the origin of different red hues of Roman copper-based red opaque glass sectilia, to shed light on the production technology behind them. This objective was achieved by the depth study of the samples of glass sectilia, which decorated the villa of co-Emperor Lucius Verus (161–169 AD). These were selected for analysis due to their abundance, the certainty of their date and of their different red and orange hues. Using OM (optical microscopy), colourimetry and FORS (fibre optical reflectance spectroscopy) spectroscopy, four red and four orange hues were individuated. A set of representative samples for each hue was analysed by EPMA (electron probe microanalyses) to detect any correlation between colour and chemical composition. Crystalline phases were investigated through high-resolution FEG–SEM (field emission gun scanning electron microscope), μRaman spectroscopy and XRD, for the identification of colouring and opacifying agents and to understand how t...
During his life in the sixteenth century, Bernard Palissy was involved in a wide variety of scien... more During his life in the sixteenth century, Bernard Palissy was involved in a wide variety of scientific and technical activities. In his last period, he was involved mostly in the development of ceramics, in particular for coloured objects. Based on a few examples, this contribution shows how chemical analysis of materials can reveal the originality of the art developed by Bernard Palissy.
Inspired by an industrial process to protect manufactured glass windows against atmospheric alter... more Inspired by an industrial process to protect manufactured glass windows against atmospheric alteration during their storage and transport, the current research is focused on the potentiality that a surface deposit of a small amount of zinc salts may efficiently reduce the alteration kinetics of chemically unstable ancient glass (alkali (Na,K)–rich silicate). To this purpose, the protective action of zinc salts was investigated by the mean of ageing experiments (temperature and humidity control) on a relevant ancient glass composition replica. When the treatment was performed on pristine glass (about 1 μg/cm2 of deposited Zn2+ ions), treated glass plates developed a significantly thinner hydrated layer than the untreated one at 80°C or 40°C (85 RH%). Furthermore, the zinc salts treatment modifies the nature of salts on glass surface. Different Zn(II) species were identified on the glass surface prior to or after the ageing. The study of the Zn(II) speciation on glass surface by grazi...
The development of new efficient protective methods for ancient glass objects that decay under at... more The development of new efficient protective methods for ancient glass objects that decay under atmosphere could only be achieved through a better understanding of the alteration mechanisms on a very small scale. To this end, ageing experiments (temperature and humidity control) are conducted on relevant chemically unstable ancient glass composition replicas (alkali (Na,K)–rich silicate). Ageing temperature and glass composition effects on the chemical, morphological and structural evolution of the glass surface replica are evaluated by a combination of multi-tool analysis. Our results put in evidence the non-correlation between the weathering process (formation of a hydrated surface layer) and the departure of alkalis. The slow diffusion of alkalis may be related to the all-solid-state character of the altered layer: all molecular water is H-bound to the network or as Si-OH. These water molecules do not have the same solvation properties than liquid water. Moreover, we highlight a s...
This work aimed to investigate the origin of different red hues of Roman copper-based red opaque ... more This work aimed to investigate the origin of different red hues of Roman copper-based red opaque glass sectilia, to shed light on the production technology behind them. This objective was achieved by the depth study of the samples of glass sectilia, which decorated the villa of co-Emperor Lucius Verus (161-169 AD). These were selected for analysis due to their abundance, the certainty of their date and of their different red and orange hues. Using OM (optical microscopy), colourimetry and FORS (fibre optical reflectance spectroscopy) spectroscopy, four red and four orange hues were individuated. A set of representative samples for each hue was analysed by EPMA (electron probe microanalyses) to detect any correlation between colour and chemical composition. Crystalline phases were investigated through high-resolution FEG-SEM (field emission gun scanning electron microscope), µRaman spectroscopy and XRD, for the identification of colouring and opacifying agents and to understand how t...
Faience technology was known in Egypt since the Predynastic Period and practiced for a period als... more Faience technology was known in Egypt since the Predynastic Period and practiced for a period also in Bronze Age Greece, but, having been lost, was reintroduced to the Greek world only in the first half of the first millennium BC. The Greek island of Rhodes and the Greek-Egyptian trade harbour of Naukratis in the Nile Delta are suspected to be key centres of early Greek-style faience production, exporting amulets and vessels across the Mediterranean region. Yet, the nature and scale of their production and their role in technology transfer, vis-à-vis Egyptian and Levantine/Phoenician production, remain little understood. The main aim of this study was to discover whether it is possible to define chemical characteristics for the faience produced and found at Naukratis, and to use this data to differentiate between artefacts produced here and elsewhere. A programme of ion beam (PIXE and PIGE) analysis was conducted under the CHARISMA transnational access scheme, known to be a suitable...
npj Materials Degradation
The glass composition is a determining parameter that influences the glass chemical durability, p... more The glass composition is a determining parameter that influences the glass chemical durability, particularly in atmospheric conditions (defined by the relative humidity, RH,
npj Materials Degradation
While glass alteration in liquid water has been widely studied for decades, glass alteration in u... more While glass alteration in liquid water has been widely studied for decades, glass alteration in unsaturated atmosphere (relative humidity, RH
Journal of the American Ceramic Society
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Papers by Patrice Lehuédé