title: Crystal and magnetic structure in co-substituted BiFeO3.
abstract: Ultra-high-resolution neutron diffraction studies of BiFe(0.8)Co(0.2)O3 show a transition from a cycloidal space modulated spin structure at T = 10 K to a collinear G-type antiferromagnetic structure at T = 120 K. The model of antiparallel directions of Fe(3+) and Co(3+) magnetic moments at the shared Wyckoff position describes well the observed neutron diffraction intensities. On heating above RT, the crystal structure of BiFe(0.8)Co(0.2)O3 changes from a rhombohedral R3c to a monoclinic Cm. At 573 K only the Cm phase is present. The collinear C-type antiferromagnetic structure is present in the Cm phase of BiFe(0.8)Co(0.2)O3 at RT after annealing.
authors.affiliation: Institute of Experimental Physics, Physics Faculty, University of Warsaw , Hoża 69, 00-681 Warsaw, Poland.
authors.forename: Izabela
authors.initials: I
authors.lastname: Sosnowska
authors.forename: Masaki
authors.initials: M
authors.lastname: Azuma
authors.forename: Radosław
authors.initials: R
authors.lastname: Przeniosło
authors.forename: Dariusz
authors.initials: D
authors.lastname: Wardecki
authors.forename: Wei-tin
authors.initials: WT
authors.lastname: Chen
authors.forename: Kengo
authors.initials: K
authors.lastname: Oka
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Shimakawa