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Detection of foreign phases in doped a-alumina powders by thermoluminescence

Abstract : The thermoluminescence (TL) after excitation by UV or X-rays radiation of doped a-alumina powders is investigated. In the case of zirconia, the alumina-zirconia composites present five of the characteristic peaks of zirconia at -170, -145, -90, 0 and 95°C. After a thermal treatment of mixed oxides, a new peak is observed at -35°C in TL. This peak reveals the presence of stabilized tetragonal zirconia in the material. In the case of calcium, the TL curves of a-alumina doped by calcium present a double peak around 110 and 130°C which can be attributed to the presence of the hibonite phase: CaAl12O19. Moreover, in the case of zirconia, by comparing this analysis with those realised by X-rays diffraction (XRD), it can be shown that the TL has one better limit of detection than the XRD.
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Christian Sallé, Frédérique Ferey, Philippe Grosseau, Bernard Guilhot, Philibert Iacconi, et al.. Detection of foreign phases in doped a-alumina powders by thermoluminescence. Journal of Thermal Analysis and Calorimetry, Springer Verlag, 2003, 73 (1), pp.25-33. ⟨10.1023/A:1025117104474⟩. ⟨emse-00520259⟩



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