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In an effort to better determine the thermodynamic properties of Al(g) and Al 2 O(g) the vapour in equilibrium with Al(l) + 4 at.% yttria-stabilized zirconia (YSZ) was compared to the vapour in equilibrium with Al(l) + Al 2 O 3 (s) over the temperature range 1197 – 1509 K. This comparison was made directly by Knudsen effusion-cell mass spectrometry with an instrument configured for a multiple effusion-cell vapour source ( multi-cell KEMS ). Second-law enthalpies of vaporization of Al(g) and Al 2 O(g) together with activity measurements show that Al(l) + YSZ is thermodynamically equivalent to Al(l) + Al 2 O 3 (s), indicating that Al(l) remained pure and Al 2 O 3 (s) was present in the YSZ-cell. Subsequent observation of the Al(l)/YSZ and vapour/YSZ interfaces revealed a thin Al 2 O 3 -layer had formed, separating the YSZ-cell from Al(l) and Al(g) + Al 2 O(g), effectively transforming it into an Al 2 O 3  effusion-cell. This behaviour agreed with observations made for β-NiAl(Pt) alloys measured in YSZ effusion-cell.

Comparing the thermodynamic behaviour of Al(l) + ZrO 2 (4% Y 2 O 3 ) and Al(l) + Al 2 O 3