Vibrational Spectroscopic Study of the System α-Co2SiO4–α-Ni2SiO4

The blue pigment as well as other materials in a blue, white and 'gold' 17th century Delft dish were analysed and compared to the blue pigment(s) used in a modern blue-and-white Delft dish, obtained from a tourist shop in Amsterdam in 2004. The ancient Delft blue pigment was compared to a commercial Delft blue powder identified as a cobalt-doped willemite, Zn 2−x Co x SiO 4 . The 17th century Delft pigment showed a closer correspondence to the olivine, alpha-cobalt silicate. The pigment in the modern blue Delft dish was mainly a vanadium-doped zircon, ZrSiO 4 :V 4+ , with small amounts of cobalt, identified by EDX analysis. The cobalt compound could, however, not be characterised here for the modern dish. The pigment in the 'golden' rim was identified as pyrochlore yellow, PbSnSbO 6.5 .

Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

“…[16] 17 th century Delft plate/cm −1 Co-olivine 'mineral' [20] CoO-SiO 2 glass [21] Synthetic alpha-Co 2 SiO 4 [13,14] Synthetic [16] 248 m www.interscience.wiley.com/journal/jrs…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Micro‐Raman and portable Raman spectroscopic investigation of blue pigments in selected Delft plates (17–20th Century)

Waal

2009

Lancaster delftware: a Raman spectroscopy, electron microscopy and Mössbauer spectroscopy compositional study

Jay

Cashion

Blenkinship³

2015

In 2008, excavations were conducted by the Northern Ceramic Society at the site of the former Lancaster delftware potworks, which operated between 1754 and about 1790. The recovered sherds have been non-destructively examined by Raman and electron microscopies and the iron phases in the biscuit by Mössbauer spectroscopy. These methods have provided a new understanding of the mineralogy of the delftware produced at Lancaster using clay imported from Carrickfergus in Ireland and blended with the local ferruginous-aluminous clays. This has implications for the attribution of delftware produced at Liverpool, Bristol, Scotland and Ireland. The Carrickfergus clay has been found to be highly dolomitic resulting in the body of the delftware forming diopside and the magnesian olivine forsterite, when fired. Brookite had not converted to rutile, nor had tridymite, nor cristobalite formed; the K-feldspars did not undergo further chemical reactions, and the observation of metakaolin would suggest that the biscuit firing temperature was in the order of 800-900°C. Chalcedony containing moganite was established as the silica source. A cobalt-containing lead-tin glaze was applied to the biscuit body and, after decorating, was fired. The mineralogy of the pigments used to decorate the objects indicate the yellow to be the PbSbSn triple oxide, the green to be a copper silicate mixed with lead-tin yellow, the purple and browns to be manganese silicates and the blue to contain cobalt spinels and cobalt pyroxenes. Diopside crystals together with recrystallised tin agglomerates have been observed floating within the glaze.

Overview about Raman spectroscopy of types of olivine group minerals: A brief review

Nascimento-Dias

2022

The main idea of this work is to develop a brief synthesized review of the spectra of the members of the olivine group (forsterite, fayalite, Co‐olivine, and Ni‐olivine). In particular, the objective is to descriptively evaluate the different κ1 and κ2 values from the spectral bands of each mineral. The results gathered from the documentary survey of several published articles, it was possible to notice a substantial difference between the κ1 and κ2 values of forsterite and the other members. On the other hand, the difference between the values of κ1 and κ2 among the other members is almost imperceptible (fayalite, Ni‐olivine, and Co‐olivine). Thus, the probable main difference between all fayalite and other members (Co‐ and Ni‐olivine) can be seen in lower wavenumbers between 200 and 300 cm−1. In conclusion, if the objective is just to distinguish olivine, the doublet band is a good parameter to be used, but if you want to detail about which mineral of the olivine group was analyzed, the lower wavenumbers probably are the best choices.