Ferroelectric Instability and Dimensionality in Bi-Layered Perovskites and Thin Films

Table 2

Positional and thermal parameters of the paraelectric phase (I4/mmm) SrBi₂Ta₂O₉ at 1000 K [25].

Atom	𝑥	𝑦	𝑧	𝐵eq(𝐴)
Sr	0	0	0	1.09 (1)
Bi	0	0	0.2007 (1)	3.41 (1)
Ta	0	0	0.4140 (1)	0.05 (1)
O(1)	0	0.5	0.25	0.8 (6)
O(2)	0	0	0.5	1.41 (5)
O(3)	0	0.5	0.0756 (3)	0.75 (4)
O(4)	0	0	0.3479 (5)	1.17 (4)