Influence of fluorides on polymorphous transformation of α-Al2O3 formation
Ž Živkovic, N Štrbac, J Šesták - Thermochimica acta, 1995 - Elsevier
Results of investigation into the influence of added fluorides (AlF3, CaF2, MgF2, LiF, NaF
and Na3AlF6, up to 10%) at the temperature of the polymorphous transformation γ-Al2O3⇒
α-Al2O3 are presented. It was determined that, at a heating rate of 10° C min− 1, addition of
2% fluoride decreases the transformation temperature by 400° C for AlF3, by 220° C for
MgF2, and by 130° C for CaF2. The other fluorides have no effect. The mechanism of the
influence is determined, and it can be explained by the formation of fluorine bridges …
and Na3AlF6, up to 10%) at the temperature of the polymorphous transformation γ-Al2O3⇒
α-Al2O3 are presented. It was determined that, at a heating rate of 10° C min− 1, addition of
2% fluoride decreases the transformation temperature by 400° C for AlF3, by 220° C for
MgF2, and by 130° C for CaF2. The other fluorides have no effect. The mechanism of the
influence is determined, and it can be explained by the formation of fluorine bridges …
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