New spectroscopic and diffraction data to solve the vanadium-doped zircon pigment conundrum
| Autor: | Ardit, M., Cruciani, G., Di Benedetto, F., Sorace, L., Dondi, M., DI BENEDETTO, Francesco |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Diffraction
V4+ Materials science Analytical chemistry Vanadium chemistry.chemical_element Socio-culturale 02 engineering and technology Crystal structure 010402 general chemistry 01 natural sciences Spectral line Ion law.invention Colour Economica law Materials Chemistry Electron paramagnetic resonance Ambientale Optical spectra 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Ceramics and Composites Colour Crystal structure EPR Optical spectra V4+ EPR 0210 nano-technology Powder diffraction Zircon |
| Zdroj: | Journal of the European Ceramic Society 38 (2018): 5234–5245. doi:10.1016/j.jeurceramsoc.2018.07.033 info:cnr-pdr/source/autori:Ardit, Matteo; Cruciani, Giuseppe; Di Benedetto, Francesco; Sorace, Lorenzo; Dondi, Michele/titolo:New spectroscopic and diffraction data to solve the vanadium-doped zircon pigment conundrum/doi:10.1016%2Fj.jeurceramsoc.2018.07.033/rivista:Journal of the European Ceramic Society/anno:2018/pagina_da:5234/pagina_a:5245/intervallo_pagine:5234–5245/volume:38 |
| Popis: | The literature on V-doped zircon pigments offers a puzzling situation with unanswered questions about the origin of turquoise colour. In this study, new diffraction (XRPD) and spectroscopic (EPR, EAS) data were obtained on four industrial pigments, whose vanadium content is much higher than samples from previous investigations. Both EPR features and XRPD results indicate the occurrence of tetrahedrally-coordinated V4+ at the zircon interstitial site 16g. EPR spectra at 5 K exhibit a structured multiplet attributed to isolated V4+ ions and an exchange-narrowed line resulting by clustering of V4+ ions. The intensity of optical bands is stronger in samples affected by V4+ clusters. However, the turquoise colour stems from the window of transmitted green-bluish light, which depends on both the tail of the main optical band (2B ⟵ 2A) and the onset of charge transfer phenomena. Small variations in these two bands readily turn into a chromatic shift from light blue to green. |
| Databáze: | OpenAIRE |
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