Phase relations in the system of Al 2 O 3 -; h 2 O at high temperatures and pressures

Abstract

Al2O3-H2O was studied at PH2O 5-40 katm. at 100-600°. At 40 katm. pressure, max. temp. of trihydrate gibbsonite stability is 295°, that of monohydrate diaspore 590°, and the boehmite polymorph of the latter is always formed metastably. Diaspore may have been formed ambiently geologically. [on SciFinder(R)]