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Terahertz Probing Irreversible Phase Transitions Related to Polar Clusters in Bi0.5Na0.5TiO3‐Based Ferroelectric
Advanced Electronic Materials ( IF 6.2 ) Pub Date : 2020-02-16 , DOI: 10.1002/aelm.201901373
Jiyue Wu 1 , Wenfeng Sun 2 , Nan Meng 1 , Hangfeng Zhang 1 , Vladimir Koval 3 , Yan Zhang 2 , Robert Donnan 4 , Bin Yang 2, 5 , Dou Zhang 6 , Haixue Yan 1
Affiliation  

Electric‐field‐induced phase transitions in Bi0.5Na0.5TiO3‐based relaxor ferroelectrics are essential to the control of their electrical properties and consequently in revolutionizing their dielectric and piezoelectric applications. However, fundamental understanding of these transitions is a long‐standing challenge due to their complex crystal structures. Given the structural inhomogeneity at the nanoscale or sub‐nanoscale in these materials, dielectric response characterization based on terahertz (THz) electromagnetic‐probe beam fields is intrinsically coordinated to lattice dynamics during DC‐biased poling cycles. The complex permittivity reveals the field‐induced phase transitions to be irreversible. This profoundly counters the claim of reversibility, the conventional support for which is based upon the peak that is manifest in each of four quadrants of the current–field curves. The mechanism of this irreversibility is solely attributed to polar clusters in the transformed lattices. These represent an extrinsic factor, which is quiescent in the THz spectral domain.

中文翻译:

太赫兹探测与Bi0.5Na0.5TiO3基铁电体中的极性簇有关的不可逆相变

Bi 0.5 Na 0.5 TiO 3中电场诱导的相变基于松弛的铁电体对于控制其电性能至关重要,因此在革新其介电和压电应用方面也至关重要。然而,由于其复杂的晶体结构,对这些转变的基本理解是一项长期的挑战。考虑到这些材料在纳米级或亚纳米级的结构不均匀性,基于太赫兹(THz)电磁探针束场的介电响应特性在直流偏置的极化循环中固有地与晶格动力学相协调。复介电常数表明场诱导的相变是不可逆的。这深刻地反驳了可逆性的主张,可逆性的传统支持基于在电流场曲线的四个象限中每个象限中都出现的峰值。这种不可逆性的机理仅归因于转化晶格中的极性簇。这些代表外在因素,在THz频谱域中是静态的。
更新日期:2020-02-16
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