Yttrium-modified Bi₇Fe₁.₅Co₁.₅Ti₃O₂₁ ceramics with improved room temperature multiferroic properties
2014
Huang, Yan | Sun, Shujie | Wang, Guopeng | Wang, Jianlin | Peng, Ranran | Lu, Yalin
Yttrium-modified Bi₇Fe₁.₅Co₁.₅Ti₃O₂₁ Aurivillius phase oxides were synthesized using a modified Pechini method, and their multiferroic properties were investigated as a function of the Y content in the formula Bi₇₋ₓYₓFe₁.₅Co₁.₅Ti₃O₂₁. X-ray diffraction investigation suggests the formation of a pure Aurivillius phase when the Y content is less than 1.25, and a Co-doped BiFeO₃ impurity appears when the content exceeds 1.25. When the Y content is 1.25, the sample exhibits significantly improved room temperature multiferroic properties with a remanent polarization 2Pᵣ of 11.72 μC cm⁻² and a remanent magnetization 2Mᵣ of 3.2 emu g⁻¹. Derivative thermo-magneto-gravimetry measurement indicates that the measured magnetic properties mainly originate intrinsically from the Y-modified Aurivillius phases when the Y content is less than 1.25.
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