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Powder XRD patterns of samples sintered at 1150 and in air and in a flow of oxygen. XRD data of Z-type are also shown for comparison. The rectangles at the bottom represent the calculated peak positions for the U-, Z-, M- , and X-type structures.
(a)  zone-axis ED pattern of at room temperature. (b) Atomically resolved HAADF image taken along the  direction. A schematic drawing of the corresponding crystal structure is shown on the right side.
Powder ND patterns of measured at 20, 450, and 650 K. (Inset) Temperature dependence of the peak intensities of the peak, the and reflections. Temperature dependence of the magnetization measured at 0.01 T is also shown.
Magnetic-field dependence of (a) magnetization and (b) electric polarization at selected temperatures for a postannealed sample of . Inset of (a): an expanded view of the data at 200 K.
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