Time-resolved and temperature-dependent spectra of chromium(III) in glasses and spinel-type glass-ceramics
โ Scribed by Mehdi Bouderbala; Georges Boulon; Renata Reisfeld; Alla Buch; Moshe Ish-Shalom; Anne-Marie Lejus
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 260 KB
- Volume
- 121
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
Time-resohrd spectroscopy or Cr'+-doprd glasses or spmel-lype glass ceram~cz ulth limruum and lllamum-zmzomum as nuclca~ng agent. allows us 10 dwmgt.nsh the long-hved 'E and short-hved 'T2 sIa[es Temperalure dependence and ume resolulion permll us lo locale the varrous energy levels and presence or aggregnres of Cr'+ m these syswms
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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
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
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.
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