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Report No.

Phase diagram of solid solution of BiFeO$$_{3}$$-BaTiO3$$_{3}$$ system studied by neutron and X-ray powder diffraction

Kiyanagi, Ryoji  ; Yamazaki, Tadashi*; Sakamoto, Yuma*; Kimura, Hiroyuki*; Noda, Yukio*; Oyama, Kenji*; Torii, Shuki*; Yonemura, Masao*; Zhang, J.*; Kamiyama, Takashi

BiFeO$$_{3}$$ (BFO) is well known as a room-temperature multiferroic material. The solid solution of BFO with another perovskite type ferroelectric material, BaTiO$$_{3}$$ (BTO), has been reported to have improved multiferroicity. In this presentation, the structural study of (1-$$x$$)BFO-$$x$$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 $$x$$. 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 $$x$$ 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.



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