Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-1459-C7-1462
Processing of submicron a-alumina powders doped with Mg-physical and chemical characterizationM. FILAL, D. MONCEAU, G. PETOT-ERVAS, C. PETOT and J.G. ZAO
CNRS-LPCM/UPR-211, Université Paris XIII, 93430 Villetaneuse, France
This work examines the influence of the thermal treatment conditions at T > 1150°C, on the microstructure and microchemistry of submicron a-alumina powders doped with '500 and 1650 ppm by weight of MgO. The powders have been characterized by XPS, TEM, SEM, BET surface area measurements and chemical analysis. Quantitative XPS analysis show a strong segregation of Mg at the near surface of the grains. The determining factor is the size of the grains and it has been possible to relate the amount of Mg at the periphery of the grains to the BET surface area measurements.
© EDP Sciences 1993