Figure 5

Orientation dependent G(r) and Gaussian fits of the Bi-Ti and Bi-Bi/Ti-Ti distances in Na_½Bi_½TiO₃.

(a) Portion of the experimental G(r) for Na_½Bi_½TiO₃ at E = 0 kV/mm and as a function of angle between Q and E at 4 kV/mm. The arrow indicates the progression from Q⊥E to Q_||E. Marked changes are observed for the Bi-Ti peak, whereas the Bi-Bi/Ti-Ti peak corresponding to the distances along the 〈100〉_PC direction remain relatively unaffected by the field. (b–d) Fits (dashed lines) of the experimental (open circles) for 0 kV/mm (b) and 4 kV/mm (Q_||E (c) and Q_⊥E (d)) using the three Bi-Ti distances (R₁, R₂ and R₃) and a single Bi-Bi/Ti-Ti distance. The solid black line in (b–d) represents the total fitted profile.