N2O decomposition was examined over a series of Al2O3-Fe2O3 mixed oxidic so
lids with composition ranging from 0 to 100% Of Fe2O3. The catalytic activi
ty of the solids runs parallel to the number of atoms of iron in the Al2-xF
exO3 solid solution phase. Two compensation effects are present. The first
corresponds to catalysts rich in alumina, and the second one to catalysts r
ich in hematite.