| Автор | Palanza, V |
| Автор | Chiodini, N |
| Автор | Galli, A |
| Автор | Lorenzi, R |
| Автор | Moretti, F |
| Автор | Paleari, A |
| Автор | Spinolo, G |
| Дата выпуска | 2010-11-01 |
| dc.description | In the blue colored sapphires of metamorphic origin and Verneuil synthetic studied here, the absorption-emission properties in the VIS-NIR range are largely determined by Cr<sup>3+</sup> and Ti<sup>3+</sup>, as we have been able to demonstrate recently. In that work a sharp radio-luminescence band occurring at 870 nm in Verneuil blue sapphires was left unattributed: here we give evidence for the attribution of that band to the <sup>2</sup>E emission transition of V<sup>2+</sup>, and for the existence of such an emission also in natural samples of metamorphic origin. After such a result, we accurately evaluated by EDXRF the V concentrations in various samples and found the ion more ubiquitous than foreseen. We then searched for and found, weak but diagnostic spin forbidden transitions and phonon sequencies in the absorption spectra of samples sufficiently rich in V. The experimental results just mentioned allowed us to discuss the effects of the overlap of V<sup>3+</sup> and Cr<sup>3+</sup> spin-allowed absorption bands on the spectrum of the varieties of corundum under study. To complete the updating of the interpretation, we spent a further effort to strengthen the attribution of the absorption band at 14500 cm<sup>−1</sup> (currently interpreted as an IVCT (Fe<sup>2+</sup> → Fe<sup>3+</sup>)) to the <sup>5</sup>E→<sup>5</sup>T<sub>2</sub> transitions of Cr<sup>2+</sup>. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Копирайт | © 2010 IOP Publishing Ltd |
| Название | Updating of the interpretation of the optical absorption and emission of Verneuil synthetic and natural metamorphic blue sapphire: the role of V<sup>2+</sup>, V<sup>3+</sup> and Cr<sup>2+</sup> |
| Тип | paper |
| DOI | 10.1088/1757-899X/15/1/012087 |
| Electronic ISSN | 1757-899X |
| Print ISSN | 1757-8981 |
| Журнал | IOP Conference Series: Materials Science and Engineering |
| Том | 15 |
| Первая страница | 12087 |
| Последняя страница | 12094 |
| Аффилиация | Palanza, V; Department of Materials Science, University of Milano-Bicocca, Via Cozzi 53, Milano 20125, Italy |
| Аффилиация | Chiodini, N; Department of Materials Science, University of Milano-Bicocca, Via Cozzi 53, Milano 20125, Italy |
| Аффилиация | Galli, A; Department of Materials Science, University of Milano-Bicocca, Via Cozzi 53, Milano 20125, Italy |
| Аффилиация | Lorenzi, R; Department of Materials Science, University of Milano-Bicocca, Via Cozzi 53, Milano 20125, Italy |
| Аффилиация | Moretti, F; Department of Materials Science, University of Milano-Bicocca, Via Cozzi 53, Milano 20125, Italy |
| Аффилиация | Paleari, A; Department of Materials Science, University of Milano-Bicocca, Via Cozzi 53, Milano 20125, Italy |
| Аффилиация | Spinolo, G; Department of Materials Science, University of Milano-Bicocca, Via Cozzi 53, Milano 20125, Italy |
| Выпуск | 1 |
