Figure 5
Structure of the low-temperature Mg(BH4)2 phase in space group P61 viewed along the hexagonal a axis, showing two unit cells. The small opaque tetrahedra are BH4 units; the larger (partially transparent) tetrahedra represent Mg and the four nearest B atoms. MgB4 tetrahedra are coloured according to their projection along a; units centred near 0, 1/4, 1/2 and 3/4 are coloured red, green, blue and grey, respectively. |