Structural and vibrational characterization of medieval like glass samples

Ferri, Lavinia de; Bersani, Danilo; Lorenzi, Andrea; Lottici, Pier Paolo; Vezzalini, Giovanna

doi:10.1016/j.jnoncrysol.2011.12.071

Cited by 19 publications

(13 citation statements)

References 78 publications

(120 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If X-ray diffraction has revealed very useful to solve the structure of crystalline silicates [9], 29 Si NMR [10] and Raman spectroscopy [11] are more appropriate to gain information on the short-range structure of amorphous silicates. Raman spectra of these latter are characterized by two main bands: one centered at 500cm -1 originating from (generally degenerated) intra-tetrahedral O-Si-O angle bending and one centered at 1000 cm -1 , attributed to (symmetric) Si-O bond stretching modes [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Vibrational properties of silicates: A cluster model able to reproduce the effect of “SiO4” polymerization on Raman intensities

Labet

Colomban

2013

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

An ensemble of ten silicate clusters is examined using quantum chemical calculations (Density Functional Theory) as a potential model to study the effect of polymerization of the SiO 4 units on Raman intensities of silicates (crystalline and amorphous). Quite originally, instead of saturating non-bridging oxygen (NBO) with hydrogen atoms as generally found in the literature for similar approaches, NBOs, which hold a negative charge if not saturated, have been substituted by isoelectronic fluorines whose mass is corrected in normal mode calculations to be equal to that of an oxygen. By adjusting the number of fluorines per silicon, the different Q n coordination types characterizing the different classes of silicates are modeled. The relevance of this ensemble of clusters as a model to study the effect of polymerization on Raman intensities is established in several steps, the most important one being the qualitative reproduction of evolution of the Ip polymerization index with the number of bridging oxygen per silicon.

show abstract

Section: Introductionmentioning

confidence: 99%

Vibrational properties of silicates: A cluster model able to reproduce the effect of “SiO4” polymerization on Raman intensities

Labet

Colomban

2013

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

show abstract

“…However, these techniques are often expensive or not easily available, e.g., Particle Induced X‐Ray (PIXE), Gamma Ray Emission (PIGE), portable X‐Ray Fluorescence (p‐XRF), or analytical techniques based on synchrotron radiation . There are other techniques which are quite unsuitable for the study of whole archeological objects because they require samples to be taken from the object and prepared for analysis (often involving grinding), so damaging or destroying the object (e.g., Transmission Electron Microscopy, TEM; X‐Ray Diffraction, XRD; Nuclear Magnetic Resonance Spectroscopy, NMRS; Differential Thermal Analysis (DTA) . Moreover, the complex composition and nanostructure of ancient glass pieces, their unstable thermodynamical properties and the fact that they have no crystallographic restrictions or stoichiometric ratios mean that a detailed knowledge of properties such as color and durability can only be acquired with advanced techniques…”

Section: Introductionmentioning

confidence: 99%

“…In addition, TEM and XRD were used to identify dispersed crystals of metallic copper, characteristic of a traditional red glass called copper‐ruby manufactured since Ancient Egyptian times (1500 B.C.) . However, invasive, destructive techniques similar to these clearly cannot be used on ancient objects from our archeological and historical heritage that we are seeking to preserve for posterity.…”

Section: Introductionmentioning

confidence: 99%

“…Fortunately, there are a number of nondestructive analytical techniques (i.e., Micro‐Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy, micro‐ATR‐FTIR; Raman Microscopy, RM; Scanning Electron Microscopy Energy dispersive X‐ray Spectroscopy, SEM‐EDS; etc. ), which can provide detailed information about corrosion processes for example, or can shed light on the different methods used in the manufacture of ancient glass . In particular, the degree of polymerization of the glass network and as a result its structural stability were assessed using an IR/Raman profile between 1050 and 850 cm −1 and were found to vary depending on the content of Pb–O or the melting temperature .…”

Section: Introductionmentioning

confidence: 99%

“…In particular, PCA was used for the discrimination of alteration processes and the division of glass pieces into groups based on different historical eras or low amounts of chromophores . Previous research has shown the relation between the visual aspect of the decay suffered by an ancient glass object and its chemical composition, the range of temperatures at which the craftsmen worked, depolymerization and/or ionic exchange/depletion . Indeed, the diverse oxides identified in the silicate glass from the objects provide diverse beneficial properties as network modifiers in the elaboration of high‐quality glass, i.e., by increasing the mechanical and chemical resistance of the glass (e.g., calcium oxide), decreasing the fusion temperature (e.g., sodium oxide), increasing the brightness (e.g., uranium oxide), improving the development of color and also avoiding the devitrification (e.g., lead oxide) .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Nondestructive Methodology for the Study of Colored Enamels: Insights into Manufacturing and Weathering Processes

Romero-Pastor

Navarro²,

Egido³

et al. 2013

J. Am. Ceram. Soc.

View full text Add to dashboard Cite

We studied ancient enamels on gilded copper from a collection of archeological horse harness pendants of the Museo Instituto Valencia de Don Juan (Madrid, Spain) to test the benefits of a new, nondestructive analytical methodology based on chemometric analysis (i.e., Principal Component Analysis, PCA) on micro‐ATR‐FTIR spectral data and chemical quantification using SEM‐EDS. The novelty of this approach was threefold: (i) PCA allowed the discrimination of the different harness pendants of known origin and attributed to the 14th and 15th centuries according to the chemical complex composition, nanostructure, glass weathering, and/or coloring mechanisms of each colored enamel, separately (i.e., red, purple, blue, and white), (ii) it is a cheap, easily available and nondestructive methodology that enables us to (iii) draw archeological conclusions about the quality of the manufacturing process, reassess the chronology of these objects and attempt to attribute them to different workshops according to the different traditional recipes identified. In particular, the enamels were made of alkali and/or alkaline earth lead‐glass with a wide range of chemical compounds in the form of pigments or opacifiers. Two types of coloring mechanisms were identified, colloidal particles such as copper‐ruby for red enamels, and ionic mechanisms such as Fe(II) and Co(II) to achieve a blue pigments; Mn(III) in the purple pigment; and two kind of white enamels were identified, i.e., tin oxide as an opacifier and uranium oxide. In addition, we established the reason for the poor state of conservation of some of the enamels by means of the identification of depolymerization and ion exchanges, well‐known harmful effects of glass weathering, and finally a chronology was assigned for some of these pieces according to the enamel composition.

show abstract

Nondestructive study of glassy matrix of celadons prepared in different firing temperatures

Chen

Wang

Luo

et al. 2021

J Raman Spectroscopy

View full text Add to dashboard Cite

Firing temperature is an essential indicator for the level of the manufacturing technology of ancient ceramics. Current techniques for measuring the firing temperature of ceramics are generally destructive and very complex. In this work, a series of celadon fragments were prepared at different firing temperatures (from 900 to 1,300 C) and studied by Raman spectroscopy, X-ray fluorescence (XRF), and X-ray diffraction (XRD). The XRD results show that raw materials were dissolved and melted completely to form the glass matrix of a glaze above 1,100 C. Besides, the results of XRF and Raman tests demonstrate that CaO amounts in the glaze decrease significantly with the increase in firing temperatures, which is the main factor to influence the Si-O linkages, adjust Q 1 , Q 2 , and Q 3-4 components, and modify the structure of the glass matrix during the firing process. The area ratios of the Si-O bending over stretching envelopes (A 500 /A 1,000 ) of the glassy matrix have a negative correlation to the CaO amount. In contrast, the value has an apparent positive correlation to the firing temperature. The A 500 /A 1,000 value of the glass matrix increases from 1.29 to 2.40 as the firing temperature increases from 1,100 C to 1,300 C. These results prove that Raman spectroscopy could be used as a feasible and reliable nondestructive method to establish a more accurate relationship between Raman spectral polymerization index and the firing temperature in order to identify the firing temperature of ancient ceramics.

show abstract

Structural and vibrational characterization of medieval like glass samples

Cited by 19 publications

References 78 publications

Vibrational properties of silicates: A cluster model able to reproduce the effect of “SiO4” polymerization on Raman intensities

Vibrational properties of silicates: A cluster model able to reproduce the effect of “SiO4” polymerization on Raman intensities

A Nondestructive Methodology for the Study of Colored Enamels: Insights into Manufacturing and Weathering Processes

Nondestructive study of glassy matrix of celadons prepared in different firing temperatures

Contact Info

Product

Resources

About