Mullite‐hexagonal di‐phase multiferroic behavior with enhanced ferromagnetism of (1−x)Bi2Fe4O9−xBaFe12O19 composites
Mullite‐hexagonal di‐phase multiferroic behavior with enhanced ferromagnetism of (1−x)Bi2Fe4O9−xBaFe12O19 composites
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DOI：
10.1002/pssa.201600225
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发表时间：
2016-10
期刊：
影响因子：
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通讯作者：
Ziyan Gao;Y. Pu;Jing Wei;Mouteng Yao;Q. Jin;Hanyu Zheng;Yaru Wang
中科院分区：
文献类型：
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作者：
Ziyan Gao;Y. Pu;Jing Wei;Mouteng Yao;Q. Jin;Hanyu Zheng;Yaru Wang
采用微波水热法和微波烧结法制备了（1-x）Bi 2Fe 4 O 9-xBaFe 12 O 19（x = 0.07，0.08，0.10，0.12，0.15，0.20）多铁性复合材料。复合材料的X射线衍射分析揭示了分别与钡六角铁氧体和莫来石铋铁氧体形成双相化合物。复合材料烧结表面的SEM（扫描电子显微镜）测量显示了微米尺寸的Bi 2Fe 4 O 9基体和纳米尺寸的BaFe 12 O 19。介电和复阻抗的研究表明，在材料中存在晶粒和晶界效应，以及负的电阻温度系数。电滞回线显示出明显的铁电行为。MR高达19.09 emu g−1（比纯Bi 2Fe 4 O 9基质大得多），表明增加BaFe 12 O 19含量可以增强铁磁性能。所有样品的Mr/Ms值均高于0.5（特别是，最大值高达0.89），并且其在许多应用中是优选的，例如高密度磁记录介质和永磁体。
Multiferroic (1−x)Bi2Fe4O9−xBaFe12O19 (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 Mr 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 Mr/Ms 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.