Structural Evolution and Multiferroics in Sr-Doped Bi7Fe1.5Co1.5Ti3O21 Ceramics
Structural Evolution and Multiferroics in Sr-Doped Bi7Fe1.5Co1.5Ti3O21 Ceramics
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DOI：
10.1111/jace.13495
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发表时间：
2015-05
影响因子：
3.9
通讯作者：
Jianlin Wang;Lin Li;R. Peng;Z. Fu;Min Liu;Yalin Lu
中科院分区：
文献类型：
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作者：
Jianlin Wang;Lin Li;R. Peng;Z. Fu;Min Liu;Yalin Lu
采用柠檬酸盐-硝酸盐燃烧法制备了组成为SrxBi7−xFe1.5Co1.5Ti3O21−δ(0≤x≤1，SBFCT)的陶瓷，研究了其相结构随锶含量的变化规律。当x≤为0.25时，得到了层数为n=6的纯Aurivillius相SbFCT，当x=0.50时，结构坍塌为5层，当x=0.75时，4层和5层交替，当x=1.00时，结构倒塌为4层。同时，在x&gT；0.25时出现了第二相Sr1−mBimFe1−CoIO3−γ，这是一种反铁磁的低电阻率的第二相。在室温下，单相SBFCT的铁磁和铁电性能都得到了提高，并且在单相范围内，铁磁转变温度(T_C)随掺锶水平x的增加而增大。X=0.25时的剩余磁化强度(2MR)为2.27emu/g，剩余极化(2PR)为2.89μC/cm~2。
The ceramics with the composition of SrxBi7−xFe1.5Co1.5Ti3O21−δ (0 ≤ x ≤ 1, SBFCT) were prepared by a citrate–nitrate combustion method, and the phase evolution with an increasing Sr content was investigated. Pure Aurivillius phase SBFCT with a layer number of n = 6 was obtained when x ≤ 0.25, and then the structure collapsed to 5 layers for x = 0.50, then alternating 4 and 5 layers for x = 0.75, and finally 4 layers for x = 1.00. Meanwhile, secondary phase Sr1−mBimFe1−iCoiO3−γ appeared when x > 0.25, which is antiferromagnetic (AFM) and with low resistivity. Enhanced ferromagnetic and ferroelectric properties were observed from single phase SBFCTs at the room temperature, and the ferromagnetic transition temperature (Tc) increases with the Sr doping level x in the single phase range. The remnant magnetization (2Mr) is 2.27 emu/g and the remnant polarization (2Pr) is 2.89 μC/cm2 at an applied electric field of 100 kV/cm for the x = 0.25 sample.