arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.06301cond-mat.mtrl-scicond-mat.str-el
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Bi和Fe共掺杂BaTiO3的工程室温多铁性

Engineering room-temperature multiferroicity in Bi and Fe codoped BaTiO3

Pratap Pal, Tapas Paramanik, Krishna Rudrapal, Supriyo Majumder, Satish Yadav, Sudipta Mahana, Dinesh Topwal, Ram Janay Choudhary, Kiran Singh, Ayan Roy Chaudhuri, Debraj Choudhury

摘要:

Fe掺杂到BaTiO 3中,稳定了顺电六方相,代替了铁电四氢呋喃[P. P. et al. Phys. Rev. B,101,064409(2020)]。我们发现,同时掺杂的Bi和Fe到钛酸钡有效地提高了磁电(ME)多铁性响应(铁磁性和铁电性)在室温下,通过仔细调整的Fe价态,随着控制恢复的铁电性,四相。随着Bi掺杂量的增加,Ba_(1-x)Bi_xTi_(0.9)Fe_(0.1)O_3(0<x<0.1)样品的介电常数随温度的变化逐渐增大,介电损耗角正切值逐渐减小,这使得Bi-Fe共掺杂量较高的样品(x=0.08)有望用作室温高k介电材料。有趣的是,x=0.08(Bi-Fe共掺杂)样品不仅被发现在室温下比x=0(仅掺杂Fe)强铁电性(~20倍)和铁磁性(~6倍),而且还观察到更好的绝缘性(更大的带隙),具有更大的ME耦合的间接特征,如从磁矫顽场随着温度降低的异常减少所指示的。因此,室温ME多铁性已被设计在Bi和Fe共掺杂的BTO(钛酸钡)化合物。

英文摘要:

Fe doping into BaTiO3, stabilizes the paraelectric hexagonal phase in place of the ferroelectric tetragonal one [P. Pal et al. Phys. Rev. B, 101, 064409 (2020)]. We show that simultaneous doping of Bi along with Fe into BaTiO3 effectively enhances the magnetoelectric (ME) multiferroic response (both ferromagnetism and ferroelectricity) at room-temperature, through careful tuning of Fe valency along with the controlled-recovery of ferroelectric-tetragonal phase. We also report systematic increase in large dielectric constant values as well as reduction in loss tangent values with relatively moderate temperature variation of dielectric constant around room-temperature with increasing Bi doping content in Ba1-xBixTi0.9Fe0.1O3 (0<x<0.1), which makes the higher Bi-Fe codoped sample (x=0.08) promising for the use as room-temperature high-k dielectric material. Interestingly, x=0.08 (Bi-Fe codoped) sample is not only found to be ferroelectrically (~20 times) and ferromagnetically (~6 times) stronger than x=0 (only Fe-doped) at room temperature, but also observed to be better insulating (larger bandgap) with indirect signatures of larger ME coupling as indicated from anomalous reduction of magnetic coercive field with decreasing temperature. Thus, room-temperature ME multiferroicity has been engineered in Bi and Fe codoped BTO (BaTiO3) compounds.

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