Study On Magnetoelectric Properties Of PZT+BF0 Solid Solution Ceramics

Multiferroics have been widely studied in recent years, with simultaneous ferromagnetic, ferroelectric, and/or ferroelastic ordering due to their abundant physics and potential application in the sensors, data storage, and spintronics. However, these kind of materials exhibiting both ferroelectric and ferromagnetic properties at room temperature are rare.The novel single phase multiferroic materials were prepared by doping the magnetic elements in the ferroelectric system(PZT?PZST) with the optimal sintering performance. It is expected to improve their ferromagnetic property and other properties by adjusting the composition and structure. The main systems include PZT95/5+BFO/BNF and PZST+BFO/BNF solid solution ceramics.(1)The(1-x)PZT+x BFO solid solution ceramics were prepared by a conventional solid-state reaction process. It was found that(1-x)PZT+x BFO( x=0.01~0.10)exhibited both ferroelectric and ferromagnetic properties at room temperature. The ferromagnetic increased obviously and the ferroelectric decreased when the concentration of BFO was increased and the maximum value of remanent magnetization(Mr=80memu/g) was obtained in the case of x=0.10. It was found that the ferromagnetic increased similarly when the concentration of BNF was increased in the series of(1-x)PZT+x BNF(x=0.33,0.80). However, the ferroelectric of was poor. The main reason is that the sintering temperature is too high to produce more oxygen vacancy due to the bismuth elements volatilize.(2)The PZST with doping BFO/BNF solid solution ceramics were prepared by solid-state reaction process. It was found that(1-x)PZST+x BFO( x=0.01~0.05)exhibited both ferroelectric and ferromagnetic properties at room temperature. The ferromagnetic increased obviously and the antiferroelectric decreased when the concentration of BFO was increased and A maximum value of remanent magnetization(Mr=0.52memu/g) was obtained in the case of x=0.80 in the(1-x)PZST+x BNF. In addition, the electrical hysteresis loops of the PZST+BFO ceramics under magnetic field and without magnetic field were almost no change. It showed that even if the ferroelectric and ferromagnetic achieve coexistence, and it doesn't mean that it can easily obtain the magnetoelectric control each other.