In the paper, the long-term corrosion of 19th century beads made of turquoise lead-potassium glas... more In the paper, the long-term corrosion of 19th century beads made of turquoise lead-potassium glass is investigated using polarising light microscopy, FTIR spectroscopy and scanning electron microscopy including EDX spectroscopy and elemental mapping. Corrosion of turquoise seed-bead glass of the 19th century has been shown to comprise several mutually connected processes developing in parallel and intensifying one another. These processes are the directed migration of alkali-metal impurities, the glass depolymerization, and the nucleation of micro discontinuities followed by the formation of micro cracks and their gradual growth. In course of time, their cumulative and apparently synergistic effect results in glass fracturing terminated with bead crumbling into tiny discoloured sand-like particles. All these phenomena are controlled by the common driving force, namely, by the internal stress originated from the bead production process. Thus, the phenomenon of corrosion of beads made...
Thermal-fluctuation mechanism of corrosion is inherent to 19 th century glass beads. • 19 th cent... more Thermal-fluctuation mechanism of corrosion is inherent to 19 th century glass beads. • 19 th century glass beads contain crystals of different structure and sizes. • The correlation "glass composition-a state of glass bead preservation" is found out. • The research expands data about glass manufacture technology of the 19 th century.
The article presents an experimental investigation of band-edge cathodoluminescence of CdZnSSe cr... more 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 dEg/dT in the interval from 80 to 300 K and found it to lie in the range from −2.5 × 10 to 0 eV/K. ✩This work was supported by the Russian Science Foundation ...
In the paper, the long-term corrosion of 19th century beads made of turquoise lead-potassium glas... more In the paper, the long-term corrosion of 19th century beads made of turquoise lead-potassium glass is investigated using polarising light microscopy, FTIR spectroscopy and scanning electron microscopy including EDX spectroscopy and elemental mapping. Corrosion of turquoise seed-bead glass of the 19th century has been shown to comprise several mutually connected processes developing in parallel and intensifying one another. These processes are the directed migration of alkali-metal impurities, the glass depolymerization, and the nucleation of micro discontinuities followed by the formation of micro cracks and their gradual growth. In course of time, their cumulative and apparently synergistic effect results in glass fracturing terminated with bead crumbling into tiny discoloured sand-like particles. All these phenomena are controlled by the common driving force, namely, by the internal stress originated from the bead production process. Thus, the phenomenon of corrosion of beads made...
Thermal-fluctuation mechanism of corrosion is inherent to 19 th century glass beads. • 19 th cent... more Thermal-fluctuation mechanism of corrosion is inherent to 19 th century glass beads. • 19 th century glass beads contain crystals of different structure and sizes. • The correlation "glass composition-a state of glass bead preservation" is found out. • The research expands data about glass manufacture technology of the 19 th century.
The article presents an experimental investigation of band-edge cathodoluminescence of CdZnSSe cr... more 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 dEg/dT in the interval from 80 to 300 K and found it to lie in the range from −2.5 × 10 to 0 eV/K. ✩This work was supported by the Russian Science Foundation ...
XVIII Международный научный симпозиум «Интеграция археологических и этнографических исследований»... more XVIII Международный научный симпозиум «Интеграция археологических и этнографических исследований», посвященный 80-летию со дня рождения Павла Ивановича Пучкова и 80-летию со дня рождения Альфреда Хасановича Халикова; 6 - 8 октября 2010 г., г. Казань, Kazan, Russia
Preservation of Cultural Heritage, 2nd International Forum, Moscow, October 2-5, 2012
