Point defects in alumina studied by thermoluminescence

Creators: Papin, Eric; Grosseau, Philippe; Guilhot, Bernard; Benabdesselam, Mourad; Iacconi, Philibert

Others:: Centre Sciences des Processus Industriels et Naturels (SPIN-ENSMSE) ; École des Mines de Saint-Étienne (Mines Saint-Étienne MSE) ; Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT); Département Poudres et Matériaux Multi-Composants (P2MC-ENSMSE) ; École des Mines de Saint-Étienne (Mines Saint-Étienne MSE) ; Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-SPIN; Laboratoire de Physique Electronique des Solides (LPES EA1174) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA); Alfredo Negro; Laura Montanaro; Université de Nice Sophia Antipolis

Description

Alpha alumina powders have been produced by thermal treatment under controlled atmosphere of highly pure gamma alumina. The influence of the atmosphere and the addition of dopants (Mg2+, Cr3+, Th4+) were studied by thermoluminescence (TL). TL is a technique which gives information about point defects. It allowed to reveal the presence of oxygen and aluminium vacancies. The sintering of undoped powders prepared under different atmosphere was investigated by dilatometry. Powders prepared under oxygen densify more rapidly (at least below 1600°C). It is suggested that a higher aluminium vacancy content improves aluminium diffusion

Abstract

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Point defects in alumina studied by thermoluminescence

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Abstract

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