Figure 2
Total energy curves of the nine structures corresponding to seven phases in the aleksite series as a function of the atomic volume. Open black circles represent DFT-calculated total energies. Solid black lines are determined by fitting the Murnaghan equation of state (1). Seven of these are single-module structures n = 0, 2, 4, 6, 8, 10, 12, and two are the double-layer polytypes of aleksite (5.9) and saddlebackite (7.11). |