abstract
Investigations of crystal structure and magnetic properties of Bi-0.8(Gd1-xBax)(0.2)FeO3 (x = 0, 0.5, 1) samples have been performed. The Bi0.8Gd0.2FeO3 and Bi0.8Ba0.2FeO3 compounds have been shown to crystallize in the polar space groups Pn2(1)a and R3c, respectively. It has been found that no continuous series of solid solutions is formed in the Bi-0.8(Gd1-xBax)(0.2)FeO3 system: the crystal structure of the Bi0.8Gd0.1Ba0.1FeO3 sample is characterized by a coexistence of Pnma and R3c structural phases which differ in their chemical compositions. All of the Bi-0.8(Gd1-xBax)(0.2)FeO3 (x = 0, 0.5, 1) compounds have been found to possess a spontaneous magnetization at room temperature. For Gd-containing samples, a significant enhancement of the magnetization takes place with decreasing temperature.
keywords
SUPEREXCHANGE INTERACTION; WEAK FERROMAGNETISM; PHASE-TRANSITIONS; ROOM-TEMPERATURE; BIFEO3; DIFFRACTION; MANGANITES; CERAMICS; STATE
subject category
Physics
authors
Khomchenko, VA; Shvartsman, VV; Borisov, P; Kleemann, W; Kiselev, DA; Bdikin, IK; Vieira, JM; Kholkin, AL
our authors
Andrei Kholkin
Principal Researcher
Joaquim Manuel Vieira
Retired Professoracknowledgements
The authors would like to thank Dr D D Khalyavin for fruitful discussion. V A Khomchenko is grateful to the Foundation for Science and Technology of Portugal (FCT) for financial support (Grant SFRH/BPD/26163/2005). P Borisov is grateful to the Deutsche Forschungsgemeinschaft (DFG) for financial support through SFB 491. The work was done within the EC-funded project 'Multiceral' (NMP3-CT-2006-032616) and FAME Network of Excellence (NMP3-CT-2004-500159).