Figure 6
Location of points where β2 = 0 for three different cases with different landau parameters as shown by the white dotted lines.
(a) The case of original landau parameters listed in the paper. The points of β2 = 0 locates in the tetragonal phase region and close to the T-O phase boundary. (b) A new case of different landau parameters from the original ones. The points of β2 = 0 locates in the orthorhombic phase region. (c) A new case of different landau parameters with those in (a,b). The points of β2 = 0 locates in the rhombohedral phase region.
