Absence of a structural transition up to 40 Gpa in MgB2 and the relevance of magnesium non-stoichiometry

P. Bordet, M. Mezouar, M. Nunez-Regueiro +8

We report measurements on MgB2 up to ~40GPa. Increasing pressure yields a monotonous decrease of the lattice parameters and of the c/a ratio, but no structural transition down to p…