Laser spectroscopy of chromium (III) in gahnite crystals and transparent gahnite-type glass-ceramics
โ Scribed by Vincent Poncon; Mehdi Bouderbala; Georges Boulon; Anne-Marie Lejus; Renata Reisfeld; Alla Buch; Moshe Ish-Shalom
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 286 KB
- Volume
- 130
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
Laser-excited emission spectra and decay curves of Cr3+ m gahnite-type glass-ceramics are compared with those in gahnite crystals. The nature of the CT'+ sates is determined from the positions of the emission and excitation peaks and from measurements of the decay times.
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Transparent glass ceramics with Cr(III) were obtained by different thermal treatment of glass with composition (mol%) 73.6 SiO2, 11.8 A120,, 4.2 Li20, 7.0 ZnO, 1.6 TiO2, 1.5 ZrO2, 0.3 AszOs, 0.024 Cr203, melted under various conditions. Parallel measurements of X-ray diffraction, optical and EPR spe
Laser excitation at different wavelengths was carried out on Cr'+-doped transparent glass-ceramics of composition (mole%) Ac(58.7S10Z, 16.7A120,, 17.8MgO,6.7T10~,0.03Cr~O,)andBc(49.1 SiOz, 19.7Alz0,,21.9Mg0,6.0TiO~,3.2Zr0,,0.03 Cr201), and in synthetic crystals of composition MgA120, (CT'+ ), Mg,TiO
Mullite glass-ceramics were prepared with varying concentrations of Cr(III). The X-ray absorption, emission and EPR spectra reveal that the most defined crystals are formed at the lowest concentration of Cr(II1). The concentration quenching of the luminescence is small and the quantum efficiencies h
Trivalent chromium in transparent glass-ceramics (73.6 SiOl: 11.8 Alz0,:4.2 Li,O:7.0 ZnO: 1.6 TiOz: 1.5 Zr02:0.3 AszOl: 0.024 Cr203 mole%) enters mainly the gahnite phase after an equilibrium has been reached. The intermediate phase during heat treatment is of virgilite-type Li,AlSi,\_,O,. This glas