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Multiferroic materials have both ferroelectric the orderly and ferromagnetic orderly two degrees of freedom , and the magnetic coupling effect , thus has broad application prospects in the new storage materials , composite devices , sensors and spintronics devices . The BiFeO 3 ( BFO) is a single-phase multiferroic material at room temperature under a few have both ferroelectric and ferromagnetic , which in recent years become a focus for researchers . The systematic study of the papers of the the BFO series ceramics and film , mainly in the following areas of work : pure ceramic and film is difficult to obtain because of the temperature sensitivity for the BFO , we study comparing various ceramic sintering method, and found that improved solid phase reaction method of BFO ceramic into a phase optimal , and ultimately determine the optimum sintering temperature and time of the target, 850 ℃ and 20min , respectively , after the introduction of dopant ions sintering temperature increased . The optimized films by RF magnetron sputtering process to obtain the optimal process parameters , good pure phase BFO thin film samples were prepared . BFO samples valence fluctuation due to volatile elements of Bi and Fe ions and often result in large leakage currents , which would seriously affect the ferroelectric , dielectric properties . Doping is recognized as an effective way to solve this problem . We tried the preparation of samples using the above optimization process , the A bit Dy doping Ti doped bit B , and AB bit Dy-Ti doped research to improve the performance of the BFO ceramic and a thin film sample , the effect is good . Pure BFO and the doping amount of 5%, 10%, 20 % of the samples together and compare the influence of the doping on the ceramics, and the thin film microstructure and macroscopic properties , determine the best proportion of doping . For the Dy doping BDFO sample doping amount is 10% , the ceramics, and the film shows the optimum ferroelectric and dielectric properties ; for Ti doped BFTO samples , a doping amount of 5 % of the ceramic sample performance preferably , while the doping amount of 10% of the film sample optimal performance ; Dy-Ti the codoped BDFT samples good ferroelectric properties high frequency dielectric intolerable .
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