Characterisation and Modelling of the 450 K TSL Peak of Alpha Alumina by the Simultaneous Analysis of TSL, TSC and TSEE

Guissi, S.; Iacconi, P.; Bindi, R.; Lapraz, D.

doi:10.1093/oxfordjournals.rpd.a032729

Cited by 6 publications

(12 citation statements)

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“…Therefore, it could be accepted that the intensity of this emission is proportional to the concentration of traps given by the presence of different types or the concentration of divalent impurities. Both the value of activation energy and the frequency factor (s), that informs the probability per second for the release of a trapped charge carrier of the experimental TL spectra, are well correlated with the theoretical calculations made by Guissi et al (1999) and Correcher et al (2003b) corresponding to alpha alumina and diaspore, respectively (table 1). The value of the FOM is lower than 4% that indicates an acceptable good fitting (Balian and Eddy 1977).…”

Section: Thermally Stimulated Luminescencesupporting

confidence: 67%

“…This peak has also been detected in Al 2 O 3 : C that is usually employed for the estimation of environmental doses (Guissi et al 1999;Yukihara et al 2003) and in natural diaspore (Correcher et al 2003b). It happens despite (i) this TL emission stems from aluminium oxide instead of diaspore, which possesses a different structure and (ii) its origin formed initially in oxidizing atmosphere and subsequently maintained in depleted oxygen atmosphere.…”

Section: Thermally Stimulated Luminescencementioning

confidence: 74%

“…The well-defined peak at lower temperature can be deconvoluted into two components (peaked at 157 and 177°C) assuming first order kinetics. (Guissi et al 1999;Garcia-Guinea et al 2005). In addition, the intrinsic structure of these specimens (leucite, sillimanite and mullite) includes twinning planes, antiphase domain boundaries, exsolution borders, modulations, etc.…”

Section: Thermally Stimulated Luminescencementioning

confidence: 99%

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Study of aluminium oxide from high-alumina refractory ceramics by thermoluminescence

et al. 2008

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This work is focused on the study of the thermally stimulated blue emission of aluminium oxide (Al 2 O 3 ) that has been removed from twenty different high alumina-rich refractory bricks. The glow curve sensitivity of several alumina grains are defined by (i) a maximum centred at about 165°C that can be deconvoluted into two first order kinetic peaks at 157 and 177°C and (ii) a broad structure over 200-220°C that suggests a continuous trap distribution system. The isolated grains, analysed by means of X-ray diffraction, are composed of 43% of alumina (Al 2 O 3 ), 22% of mullite [72% of Al 2 O 3 and 28% of SiO 2 ], 12% of leucite (KAlSi 2 O 6 ) and 23% of sillimanite [Al 2 O 3 ⋅SiO 2 ]. The sample characterization has been performed using X-ray fluorescence and scanning electron microscopy.

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Section: Thermally Stimulated Luminescencesupporting

confidence: 67%

Section: Thermally Stimulated Luminescencementioning

confidence: 74%

Section: Thermally Stimulated Luminescencementioning

confidence: 99%

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Study of aluminium oxide from high-alumina refractory ceramics by thermoluminescence

et al. 2008

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“…As illustrated in Figure 3, neither saturation (or sub‐linearity) of the TL signal has been detected for this peak within the dose ranges used up to 100 Gy, nor supra linear behavior could be detected at lower doses. This maximum has been selected on the basis of: (1) it is related to a discrete trap structure [ Garcia‐Guinea et al , 2001] and, therefore, it could be analyzed, as a good approach, in terms of first order kinetics where the intensity of the TL signal is proportional to the concentration of thermally released charges and (2) it appears also in synthetic Al 2 O 3 that is usually employed for the estimation of environmental doses [ Guissi et al , 1999]. This blue emission (at about 180°C) could be considered mainly associated to the presence of divalent impurities (e.g.…”

Section: Resultsmentioning

confidence: 99%

Recent results on the thermoluminescence properties of diaspore

Correcher

García-Guinea

Valle-Fuentes

2003

Geophysical Research Letters

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[1] The presence of hydrated diaspore (a-AlOOH) on the Martian surface allows us to speculate that this material could act as: a-Al 2 O 3 precursor and water source. In this study, new analytical data on the thermoluminescence (TL) properties of natural diaspore from Goian (Pontevedra, Spain) in the UV-blue spectral region are reported. The results indicate that it could be also used as a dosimeter for dating purposes, since it possesses an acceptable sensitivity to radiation, reproducibility, linear dose response in the studied range (up to 100 Gy), and a high stability of the relative TL emission after six months of storage. Some physical trapping parameters for each irradiated curve (trap depth, pre-exponential factor, intensity and peak position) are estimated assuming first order kinetics for the 180°C TL peak.

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“…Suivant cette hypothèse, les mesures simultanées de TL et d'EETS ont conduit à une estimation de l'affinité électronique de ces pics . Notons enfin que la généralisation d'un formalisme existant (modèle de Levandowski), corrigé de façon à y inclure l'EETS, nous a permis d'expliquer le décalage observé entre les pics de PTS associés à un même piège (Guissi et al, 1999).…”

Section: La Modélisation (Depuis 1995)unclassified