Structure Determination of Ferromagnetic Perovskite BiMnO3

• Published in: Journal of solid state chemistry Vol. 145; no. 2; pp. 639 - 642
• Main Authors: Atou, T., Chiba, H., Ohoyama, K., Yamaguchi, Y., Syono, Y.
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 01.07.1999; Elsevier
• Subjects: chemical synthesis; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; crystal structure and symmetry; Exact sciences and technology; exchange and superexchange; Inorganic compounds; Magnetic properties and materials; magnetically ordered materials; neutron scattering; Nonmetallic ferromagnetic materials; Physics; Salts; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Studies of specific magnetic materials; chemical synthesis; neutron scattering; crystal structure and symmetry; exchange and superexchange; magnetically ordered materials; Inorganic compounds; Lattice distortion; Neutron diffraction; Electron diffraction; Magnetic ordering; Ternary compounds; Ferromagnetic materials; Perovskites; Experimental study; Bismuth Manganites; High-resolution methods; Superexchange interactions; Property structure relationship; Crystal structure
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1006/jssc.1999.8267

Structure of feromagnetic BiMnO3 synthesized at high pressure has been determined by electron diffraction and neutron powder diffraction. This structure is related to a heavily distorted perovskite structure, having monoclinic symmetry, space group C2, with a=9.5323(6) Å, b=5.6064(3) Å, C= 9.8535(7) Å, and β=110.667(5)°. The distortion is caused by a polarized Bi 6s2 lone pair. Every trivalent manganese cation reveals the Jahn–Teller distortion and ordering of a vacant dx2−y2 orbital is suggested to play an important role for the ferromagnetism.