Superstoichiometric mga1 o spinel and use thereof, and...

Details Superstoichiometric mga1 o spinel and use thereof, and... Superstoichiometric mga1 o spinel and use thereof, and...

C - Chemistry, Metallurgy

01

F

C01F 7/16 (2006.01) C04B 35/10 (2006.01) C04B 35/443 (2006.01) C04B 35/66 (2006.01) C30B 29/26 (2006.01)

Patent

CA 2115902

ABSTRACT A superstoichiometric MgA12O4 spinel, which can be used, for example, as material for a high temperature crucible, is synthesized by producing a precursor mixture comprising intimately mixed oxides of the corresponding metals in the spinel. Magnesium is added in a superstoichiometric amount to the precursor mixture. Prior to spinel formation, from one to five percent by weight of a reactive salt containing fluorine and/or boron, based on the metal oxides of the spinel, are added to the precursor mixture, and the doped precursor mixture is mixed for from 0.5 to 3 hours. Finally, the mixed precursor mixture is heated for between 0.5 and 4 hours at a temperature between 1150°C and 1400°C to synthesize the Mg(1+x)Al2O4 spinel which is superstoichiometric with respect to magnesium.

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