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Andrey A. Kudryavtsev

Publications and source records attributed to Andrey A. Kudryavtsev.

3 recordsLinked to original sources
arXiv2021

Crystals in the 19th century glass beads

Glass seed beads probably are the most numerous group of art historical glass. From the ancient times to the modern era, glass beads played an essential role in culture, as they were used, e.g., to decorate clothing, religious objects and functional tools, and served as an important good for global trade. The conservation state of items made of glass beads is an actual issue for curators and conservators. Glass, as well known, is often unstable material, so a number of internal and external factors are responsible for chemical and physical processes in glass and on the glass surface. It was noticed that some types of historical 19th century glass beads are subjected to more intense destruction than others. The samples of glass beads of different colours and conservation states were examined by means of SEM-EDX, EBSD, Raman and FTIR microspectroscopy. Research showed that some types of beads are characterized by the presence of nano- and microcrystals in glass, which could be one of the causes of glass destruction. The elemental composition of crystals is different in each case and depends on raw materials and technical components used for glass manufacturing. The structure of crystals was identified by means of EBSD analysis.

physics.app-ph↗
arXiv2019

Cathodoluminescence of CdZnSSe crystals synthesized in 19th century bead glass

The article presents an experimental investigation of band-edge cathodoluminescence of CdZnSSe crystals that nucleated and grew in silicate glass melt during its production. We have studied Zn-rich red glass made for manufacture of seed beads in the 19th century and found it to contain CdZnSSe crystals. Due to colloidal staining using the CdZnSSe crystallites embedded in glass, glass makers were enabled to produce lustrous red glass that, as we presently know, manifests bright luminescence. The CdZnSSe crystallites exhibit intense band-edge cathodoluminescence both at room temperature and at liquid nitrogen temperature. We have found the band-edge cathodoluminescence of these crystals to peak in the range from 2.00 to 2.03 eV at 300 K and from 2.02 to 2.06 eV at 80 K. We have also estimated the value of the band gap derivative d$E_g$/d$T$ in the interval from 80 to 300 K and found it to lie in the range from $-2.5 \times 10^{-4}$ to 0 eV/K. CdZnSSe crystals in glass demonstrate high temperature and temporal stability. The glass-crystal composite on their basis is resistant to the electron-beam irradiation and long-term weathering. Possible applications of this composite in modern technologies, and processes and components that might be used for making glass stained with CdZnSSe in the past are also discussed.

cond-mat.mtrl-sci↗