Figure 4
A scheme of the modulation functions of the atoms in the PO4 group as a function of t. The y component of the modulation is shown. The modulation functions have been simplified to emphasize the basic trends. Each jump of the tetrahedron at the discontinuity can be understood as a rotation around an axis going through the O1 and one of the O3 atoms. Symmetry code: (i) x1, -x2, x3, . |