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- Title
Thermally stimulated luminescence of a natural layered double hydroxide.
- Authors
Correcher, V.; Garcia-Guinea, J.; Rodriguez-Lazcano, Y.
- Abstract
Layered double hydroxides (LDHs) and many of the related hydrotalcite-like minerals have been well studied from the chemical and structural point of view; however, their luminescence properties have been scarcely studied. We herein report on the thermoluminescence (TL) behaviour of a natural LDH (Mg6Cr2CO3(OH)16·4H2O), previously characterized by X-ray fluorescence, X-ray energy-dispersive spectrometry, electron probe microanalysis, thermogravimetry and differential thermal analysis, that exhibited a very complex green-IR spectral emission. The broad waveband peaked at ~ 640 nm can be mainly linked to the 4T1 → 6A1 (at 570 nm), 4A2g → 2Eg (~ 685 nm), 4T1 → 6A1 (~ 700 nm), and 1T2g → 3A2g (green) and 1T2g → 3T2g (red) transitions due, respectively, to the presence of Mn2+, Cr3+, Fe2+ and Ni2+. The weak red-TL emission can likely be attributed to the quenching effect due to Fe (~ 8-11%) ions substituting for Mg2+.
- Subjects
LAYERED double hydroxides; THERMOLUMINESCENCE; ELECTRON probe microanalysis; THERMOGRAVIMETRY; MANGANESE
- Publication
Journal of Thermal Analysis & Calorimetry, 2018, Vol 133, Issue 3, p1253
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-018-7205-z