Up to now, strontium dialuminate, SrAl4O7 (SA(2)), could be synthesized only by solidification from the high-temperature liquid state. We describe its synthesis from a spray-dried amorphous precursor, and specify its stability domains. Its kinetics of formation is very low. It can be crystallized in the 900-1000degreesC temperature range either directly with a low heating rate or via two metastable solid solutions-hexagonal strontium monoaluminate (SrAl2O4 (SA)) and gamma-alumina-by annealing at 950-1000degreesC. As the temperature is raised beyond 1100degreesC, SA(2) becomes metastable, its formation is no longer possible, and the crystallization of Sr4Al4O2, (S(4)A(7)) is favored. The latter compound, whose composition is close to that of SA(2), is stable up to 1500degreesC. At higher temperature it decomposes into SA and SA(2), which in its turn decomposes into SA and SA(6) (SrAl12O19). There is again another stability domain for SA(2), restricted to a narrow temperature scale close to its melting point (similar to1800degreesC). The behaviors at crystallization from amorphous precursors at low temperature and from liquid at very high temperature are symmetrical: low heating or cooling rates produce pure SA(2) while too rapid kinetics result in mixtures of phases.