科研之友
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摘要
Multiferroic (1-x)Bi2Fe4O9-xBaFe(12)O(19) ( x = 0.07, 0.08, 0.10, 0.12, 0.15, 0.20) composites were prepared using microwave hydrothermal and microwave sintering methods. X-ray diffraction analysis of the composites revealed the formation of di-phase compounds with barium hexaferrite and mullite bismuth ferrite, respectively. SEM(scanning electron microscope) measurements on the sintered surfaces of the composites displayed the micro- sized of Bi2Fe4O9 matrix and nano-sized BaFe12O19. The study of Dielectric and complex impedance exhibited the presence of grain and grain boundary effects, and a negative temperature coefficient of resistance in the materials. The ferroelectric hysteresis loops showed an obvious ferroelectric behavior. The M-r was up to 19.09 emu g(-1) ( much larger than pure Bi2Fe4O9 matrix), indicating that increasing BaFe12O19 content could enhance the ferromagnetic properties. The value of M-r/M-s for all the samples was higher than 0.5 ( especially, the maximum was up to 0.89) and it is preferred in many applications such as magnetic recording media of high density and permanent magnets.
- 出版日期2016-10
- 单位陕西科技大学
