Analysis of glass beads from Cultural Heritage for authentication purposes [Dataset]
The considered glass beads were compositionally characterized using a multi-analytical approach. FESEM examinations were accomplished on polished surfaces and fractures, as well as on cross-sections inlayed into cold-setting epoxy resin and later mirror-polished using an aqueous suspension of cerium...
| Autores: | , , , , , , , |
|---|---|
| Formato: | conjunto de datos |
| Fecha de publicación: | 2025 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/399074 |
| Acesso em linha: | http://hdl.handle.net/10261/399074 https://doi.org/10.20350/digitalCSIC/17537 |
| Access Level: | acceso abierto |
| Palavra-chave: | Glass bead Historical glass beads Contemporary commercial beads Chromophores Opacifiers Authentication Glass by composition or origin Noninvasive testing Multi-analytical approach Laser-induced breakdown spectrocopy (LIBS) Scanning electron microscopy (SEM) X-ray fluorescence (XRF) Ultraviolet-visible spectroscopy https://www.wikidata.org/wiki/Q1435588 http://vocab.getty.edu/page/aat/300380174 http://vocab.getty.edu/page/aat/300379584 http://vocab.getty.edu/page/aat/300054601 http://vocab.getty.edu/page/aat/300010799 http://vocab.getty.edu/page/aat/300389952 http://vocab.getty.edu/page/aat/300390528 http://vocab.getty.edu/page/aat/300224957 http://vocab.getty.edu/page/aat/300224161 http://vocab.getty.edu/page/aat/300375717 |
| Resumo: | The considered glass beads were compositionally characterized using a multi-analytical approach. FESEM examinations were accomplished on polished surfaces and fractures, as well as on cross-sections inlayed into cold-setting epoxy resin and later mirror-polished using an aqueous suspension of cerium oxide. The FESEM employed was a Hitachi S-4800 cold cathode equipment, working with acceleration voltages of 7 and 15 kV. A 20 mm2 Oxford X-Max system coupled to the electron microscope with a resolution of 125 eV (Mn Kα) was used for EDS microanalyses. Samples were previously sputter-coated with graphite on a JEOL JEE4b vaporizer to make them conductive. Laser-induced Breakdown Spectrocopy (LIBS) analyses were performed using laser excitation at 266 nm (4th harmonic of a Q-switched Nd: YAG laser (Lotis TII, LS-2147), 15 ns pulses, 1 Hz repetition rate). LIB spectra were recorded using a 0.2 m Czerny-Turner spectrograph (Andor, Shamrock Kymera-193i-A) equipped with a grating of 1800 grooves/mm (blazed at 265 nm) and coupled to a time-gated intensified charge-coupled device (ICCD) camera (Andor Technology, iStar CCD 334, 1024x1024 active pixels, 13 µm x 13 µm pixel). The ICCD detector is synchronized with the Q-Switch output electrical signal that triggers the laser pulse. The laser beam was directed to the surface of the samples by the use of mirrors at an incidence angle of 45°. Focusing with a 10 cm focal length lens allowed fluences in the range of 9–15 J/cm2. LIB spectra were recorded in the 240–600 nm wavelength range using a step and glow mode at intervals of 30 nm. The spectra were acquired at a 0.17 nm resolution with a gate delay and width of 200 nanoseconds and 3 microseconds, respectively. For higher wavelengths, a cut-off filter at 300 nm was placed in front of the entrance window of the spectrograph to reduce the scattered laser light and to avoid second-order diffractions. An Ocean Optics HR 4000 CG equipment was used for UV–Vis spectrophotometry. Spectra were acquired by absorption or reflection and recorded in the 200–1000 nm wavelength range. XRF analysis was recorded with a PANalytical instrument, model Magi-X, of wavelength dispersion provided with an X-ray tube of rhodium anode (2.4 kW). Analytical recordings were accomplished using the IQ + software (PANalytical) based on fundamental patterns of synthetic oxides and natural minerals. Samples were prepared in a Perl’X3 Philips instrument starting from the powdered glasses and compacting them as pearls by melting at 1100 ºC (homogeneous mixture of 0.3 g of powdered glass with 5.5 g Li2B4O7). Data life: 2025- (unlimited validity) |
|---|