Imagine a hypothetical system with components A and B.

Which of the following are definitely true (without more information) if a crystalline compound AB12 is the stable state for a single specific overall composition over a variety of temperatures at 1 atmosphere ?

Select all that apply.

1. The system is below its melting or solidus temperature
2. The compound under these conditions has a lower Gibbs free energy compared to other phases or phase combinations
3. The compound prefers to adopt a eutectic microstructure
4. The compound prefers to adopt a eutectoid microstructure
5. Since just the compound itself is said to be stable, the system would be single-phase in equilibrium.