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X-ray diffraction patterns of (a) the pristine Bi4Ti3O12; (b) Bi4Ti3O12−x (350 °C, 20 min); (c) Bi4Ti3O12−x (350 °C, 40 min); (d) Bi4Ti3O12−x (350 °C, 60 min); (e) Bi4Ti3O12−x (350 °C, 80 min); (f) Bi4Ti3O12−x (350 °C, 100 min); and (g) Bi4Ti3O12−x (400 °C, 60 min).
