Fig. 2: Reconstructed reciprocal space maps as a function of pressure.

a–d hk0-planes for the trigonal host phase at 300 K and 0.4 GPa (a), the triclinic 1/5-phase at 300 K and 1.4 GPa (b), the monoclinic 1/6-phase at 350 K and 6.5 GPa (c), and at 42 GPa (d). e–h Same as (a–d) but for the \(h\bar{1}l\)-plane. i–l magnifications of the images shown in (e–h). The red rectangle in (b) indicates the region which is magnified in (i–l). Reciprocal lattice vectors and Miller indices h, k, and l refer to the hexagonal cell and an approximately hexagonal cell for the 1/5- and 1/6-phase. Green arrows in (j–l) depict the q-vector.