The refined XRD pattern of BTF10 using space group P-62c at room temperature. The insert is the ED pattern taken along the  zone axis.
(a) The colored ABF image of BTF10 taken along the  zone axis, red for Ba and pink for O atoms. The lower-right panel shows the original image and the unit cell obtained from refinements. The brown and blue atoms stand for atoms at M1 and M2 site, respectively. (b) The line-scan intensity profiles extracted from (a). (c) The polyhedral distortion and the schematic polaron ordering. (d, e) Parameters of dihedral angle ϕ≈ 111.9° for edge-sharing O12O22 square planes and bridging angle θ ≈ 113° for M2-O1-M2 chain, rotation angle φ = 2π/3 for one O1 vacancy among the nearest three in the edge-sharing pyramids, respectively. The schematic configuration and values are obtained from XRD refinement. (f) The ED pattern taken along the  zone axis.
(a) Temperature dependence of ZFC and FC 1/χ measured at 1 and 2 kOe, respectively. Solid lines are the fitted curves. (b) The magnetic hysteresis measured at 5, 52, and 300 K, respectively. The insert is the temperature dependent d(C/T)/dT. (c, d) Temperature dependence of ɛr and tan δ. The insert in (d) is a magnified view of tan δ measured at 8 and 10 kHz. (e) The frequency profile of tan δ ranging from 235 to 260 K. (f) Room-temperature ferroelectric loops measured at f = 10 Hz. The insert is the leakage-current curve measured at room temperature.
(a) Comparison of the absorption edges of Ti-L 23 between BTF10 collected along  and TiO2. (b) The Ti-L 23 edges collected along different directions. Contribution of the plural scattering to the absorption edges is removed using the Fourier-log mode.
The XRD pattern of BTF10 measured at higher temperatures.
(a) Time and frequency (the insert) profiles of ΔM induced by an ac E at 260 K. (b) Temperature dependence of magnetically induced α EM . (c)-(e) The dc H dependence of α EM measured at 243, 264, and 303 K, respectively. (f) The frequency dependence of α EM measured at different temperatures.
The fitted parameters for the susceptibility curves using expression (1).a
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