Phase diagram of solid solution of BiFeO-BaTiO3 system studied by neutron and X-ray powder diffraction

鬼柳 亮嗣; 山崎 但*; 坂元 勇馬*; 木村 宏之*; 野田 幸男*; 大山 研司*; 鳥居 周輝*; 米村 雅雄*; Zhang, J.*; 神山 崇

no journal, , 

BiFeO (BFO) is well known as a room-temperature multiferroic material. The solid solution of BFO with another perovskite type ferroelectric material, BaTiO (BTO), has been reported to have improved multiferroicity. In this presentation, the structural study of (1-)BFO-BTO system in order to clarify the relationship between the structure and the physical properties will be reported. From the structural analyses using neutron and X-ray powder diffraction data, it was found that there exist multiple phases in the wide range of . The coexistence of a hexagonal phase and a cubic one was confirmed suggesting the origin of the ferroelectricity of the solution to be the hexagonal phase. Structural deformation with the variation of was observed, which results in the lowering of the phase transition temperatures. Combining all the information, the whole phase diagram of BFO-BTO system with respect to temperature and the composition was drawn.