Fig. 1: Synthesis and crystal structure characterizations of PbFeO3.
From: Observation of novel charge ordering and spin reorientation in perovskite oxide PbFeO3
a Rietveld refinement for SXRD pattern recorded at room temperature for PbFeO3. Observed (black circles), calculated (red line), and difference (gray line) values are shown. The allowed Bragg positions in Cmcm symmetry are indicated by ticks (dark cyan). b ED patterns along [010] pseudocubic zone axis at RT. c Rieveld refinement for NPD pattern at 300 K for PbFeO3. Observed (black circles), calculated (red line), and difference (blue) values are shown. Bragg positions of PbFeO3 are indicated by ticks (dark cyan), which correspond to the allowed nuclear (magenta) and magnetic (dark cyan) Bragg peaks of PbFeO3; and allowed nuclear (navy) and magnetic (violet) Bragg reflections of the impurity phase Fe2O3 (~5 wt%). d Crystal structure of PbFeO3. e Left part: illustration of Pb modulations; Right part: HAADF image along [001] pseudocubic zone axis of PbFeO3. Distances for the bright spots, which are the locations of Pb, indicate a modulation with a shorter–longer–shorter pattern. f Sketch of unique -A-B-B- type of charge ordering of PbFeO3 composed of two types of differently charged layers.
