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Synthesis and Magnetic Properties of \hbox {BiFeO}_{3} , {(\hbox {BiFeO}_{3})}_{0.95}{(\hbox {BaTiO}_{3})}_{0.05} , and (\hbox {Bi}_{0.95}\hbox {Ba}_{0.05})(\hbox {Fe}_{0.95}\hbox {Ti}_{0.05})\hbox {O}_{3} Ceramics

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8 Author(s)
Chen, H.-Y. ; Dept. of Phys., Fu Jen Catholic Univ., Taipei, Taiwan ; Tu, C.S. ; Wang, T.-H. ; Ding, Y.
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Magnetization, grain size, structure, and temperature-dependent dielectric permittivity of BiFeO3, (BiFeO3,0.95(BaTiO3)0.05 -(BaTiO3)0.05(5%BTO-BFO), and (Bi0.95Ba0.05)(Fe0.95Ti0.05)O3[5%(Ba, Ti)-BFO] ceramics have been carried out. BFO and 5%BTO-BFO exhibit an typical antiferromagnetic behavior, whose magnetization curve is linear with magnetic field at room temperature. The magnetic hysteresis loop of 5%(Ba,Ti)-BFO ceramic shows a weak ferromagnetic behavior with a small remanent magnetization of about 0.01 emu/g possibly due to a higher density in the grain matrix. This result also implies that the A-and B-site substitutions with Ba2+ and Ti4+ could efficiently suppress the spiral magnetic modulation. The magnetic susceptibilities of BFO, 5%BTO-BFO, and 5%(Ba,Ti)-BFO ceramics are about 1.9 × 10-5, 5.43 × 10-6, and 8.67 × 10-6 emu/gOe, respectively. Frequency-dependent dielectric maxima were observed in BFO, 5%BTO-BFO, and 5%(Ba,Ti)-BFO ceramics upon heating. This dielectric response is likely triggered by the antiferromagnetic-paramagnetic transition near the Neel temperature.

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Magnetics, IEEE Transactions on  (Volume:47 ,  Issue: 3 )