1.
Acta Crystallogr B
; 63(Pt 4): 537-44, 2007 Aug.
Article
in English
| MEDLINE
| ID: mdl-17641422
ABSTRACT
The parameters of the crystal structure of BiFeO(3), described within the space group R3c, have been determined by high-resolution neutron powder diffraction for temperatures from 293 to 923 K. It was found that there is a local minimum for the rhombohedral angle alpha(rh), near the Néel temperature T(N) approximately 640 K, a gradual rotation of the FeO(6) octahedra and an increase of the Fe-O-Fe angle. The displacement of the Bi(3+) ions from the FeO(6) octahedra which influence the electric polarization decreases with temperature. One of the Bi-Fe distances also has a local maximum near T(N). The atomic vibrations of Bi(3+) and O(2-) ions show a significant anisotropy.
2.
Nature
; 246(5428): 90-1, 1973 Nov 09.
Article
in English
| MEDLINE
| ID: mdl-4585852