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

Carter, Elizabeth A.; Wood, Michelle L.; Waal, D. de; Edwards, Howell G. M.

doi:10.1186/s40494-017-0130-9

Cited by 16 publications

(13 citation statements)

References 22 publications

(35 reference statements)

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“…This is the case for the shipwrecks from which the shards studied here were selected [1][2][3] . Similar shards have already been studied summarily or with illumination conditions (785 nm) 4,5 under excitation which did not make it possible to characterize all the phases present as is the case when blue laser excitation is employed as has been done here. The work presented here, by coupling Raman analysis with SEM-EDXS analysis, allows the characterization of the elemental composition and to identify the molecular signatures of the constituent phases of the paste and the enamels.…”

Section: Introductionmentioning

confidence: 99%

Raman identification of the different glazing technologies of Blue-and-White Ming porcelains

Colomban

Ngo²,

Edwards³

et al. 2022

Ceramics International

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Section: Introductionmentioning

confidence: 99%

Raman identification of the different glazing technologies of Blue-and-White Ming porcelains

Colomban

Ngo²,

Edwards³

et al. 2022

Ceramics International

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“…Raman spectroscopic studies on pottery and porcelain have utilized a visible laser as the main light source. Several studies reported the Raman spectra of ceramic artifacts with near-infrared excitation. ,− These studies showed that the spectra obtained at 785 nm excitation exhibit a broad feature in a high-frequency region around 1300–2000 cm –1 , which is not present for visible excitation. This broad feature was noted as fluorescence or simply a “glassy silicate” .…”

Section: Introductionmentioning

confidence: 99%

New Probe for Porcelain Glazes by Luminescence at Near-Infrared Excitation

Kamura

Tani

Matsuo³

et al. 2021

ACS Omega

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Raman spectroscopy is a powerful technique for a wide range of materials, including porcelain, and near-infrared excitation is often used to suppress a fluorescence background from a sample. When we measured the Raman spectra of porcelains at 785 nm excitation, we observed a strong broad band in a high-frequency region, and its origin was not clearly elucidated. In this study, we have measured the spectra of glazed porcelains at 532, 785, and 1064 nm excitation and demonstrated that the broad feature originates from luminescence around 880 nm and not from Raman scattering. We provide experimental evidence showing that the band originates from a thin layer of glaze. Since the band shape depends on the processing temperature, the luminescence spectra can be a nondestructive probe for studying the glass formation of a glaze.

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“…In addition, Raman spectroscopy was carried out to confirm the variation in the R40 and R50 crystals, which changed the shape of the reflectance spectra. The Raman bands of β-wollastonite at 639 cm -1 and 973 cm -1 were identified ( Figure 10A) (Carter et al, 2017), while mapping Figure 7. SEM-BSE images and Ca mapping results of specimens R40 and R50.…”

Section: Crystal Structure Analysismentioning

confidence: 99%

A Preliminary Study on the Roles of Fe Content and Neoformed Ca-rich Minerals in the Coloration of Ceramic Glazes

2020

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Iron oxides are the essential coloring oxides in traditional ceramic glazes. However, when Fe is involved in the coloration in the form of ions or colloids in glazes with low Fe content, it is difficult to identify the iron oxide phases. Generally, in many these glazes, Ca-rich minerals are observed by X-ray diffraction (XRD) or microscopic images, owing to their devitrification by the high Ca content. This study attempts to elucidate the correlation between the crystalline structure and coloration in the glazes while mainly focusing on neoformed Ca-rich minerals and Fe content. An experimental firing was carried out to produce tree ash glazes, with pine tree ash and Buyeo feldspar. In the case of oxidation glazes, the scanning electron microscopy (SEM) images and XRD patterns did not exhibit any Ca-rich crystals, and all the visible light reflectance spectra lines exhibited a similar shape. In contrast, the reduction glazes divided into blue glazes and other colored glazes according to the shapes of their reflectance spectra. It was confirmed that the influence of Ca-rich minerals on the glaze color was more pronounced than the blue color of the reduction glazes when the Ca and feldspar contents were sufficiently high and low, respectively, to form wollastonite. As the Ca content increased and the elemental composition of the reduction glazes changed, the neoformation of the Ca-rich minerals, such as wollastonite, anorthite, diopside, and akermanite was sequentially observed.

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

Cited by 16 publications

References 22 publications

Raman identification of the different glazing technologies of Blue-and-White Ming porcelains

Raman identification of the different glazing technologies of Blue-and-White Ming porcelains

New Probe for Porcelain Glazes by Luminescence at Near-Infrared Excitation

A Preliminary Study on the Roles of Fe Content and Neoformed Ca-rich Minerals in the Coloration of Ceramic Glazes

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