Investigation of Crystal and Magnetic Structure of BiFeO₃Using Neutron Diffraction

Abstract

Polycrystalline material obtained from the ground single crystal of BiFeO3 reported as not having the superstructure, shows the superstructure reflections in neutron diffraction pattern. Tle determined magnetic moment of antiferromagnetically ordered Fe 3+ ions is µFe = (3.70±0.03)μB at 293 K.

Phase equilibrium of Bi2O3–Fe2O3 pseudo-binary system and growth of BiFeO3 single crystal

“…It is noteworthy that our cell parameters agree quite well with that reported by Sosnowska et al [19] (a ¼3.963Å and a¼89.441), where the powder was also made of BFO single crystal.…”

Synthesis and Characterization of Mn-Doped BiFeO3Nanoparticles

“…The scattered light was analyzed by a double monochromator of focal length 85 cm with a liquid-N 2 -cooled CCD (charge coupled device) detector. The result indicates that the BiFeO 3 samples had a perovskite-based rhombohedral structure as reported before [10] and no secondary phases were included up to 2%. At Mn contents larger than 3%, small impurity components appeared (see asterisks in Fig.…”

On the birefringence of magnetoelectric BiFeO3

“…Therefore, it was not possible to count the number of interference fringes along an edge of the crystal, even using an immersion oil, in order to deduce an approximate value of the optical retardation Conoscopy, on the (llO)cub plate (t= llj.l.m), with crossed polars, using immersion oil (ne= 1.518), high numerical aperture (NA = 1.40 oil) front lens on the condenser and high numerical aperture objective (100 x/1.30 oil) was an invaluable help to deduce the interference order at room temperature, even though the melatope, the trace of the optical axis, was outside the field of view. By observing the motion of the isogyre when rotating the microscope stage, thus rotating the crystal, it was deduced that the first to the fifth isochromes for green light (551 nm) and the first to the fourth isochromes for red light (643 nm) were inside the conoscopy field of view ( (2) where B=_aA35.3° is the angle between the optical axis (OA// Ps) and the normal (N) to the (llO)cub platelet. Thus:…”