Spectroscopy and EPR of chromium(III) in mullite transparent glass-ceramics
โ Scribed by R. Reisfeld; A. Kisilev; A. Buch; M. Ish-Shalom
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 311 KB
- Volume
- 129
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
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 high as compared with glasses.
๐ SIMILAR VOLUMES
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
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.
Absorption, eMon and excitation spectra of c~o~um~II1~ were cittzained For tfanspaient glass ocramics mntaining @+artz and petaliteiike phases. Emission from the 2E and 4T, levels was obserwd si.muItaneousIy at room temperafure. Ligand field strengths of Cr(IIr) m the crystxlhe phare are comparable