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Tunable phase transition in (Bi0.5Na0.5)0.94Ba0.06TiO3 by B-site cations
Applied Physics A ( IF 2.7 ) Pub Date : 2020-03-13 , DOI: 10.1007/s00339-020-3448-1
Wenhao Liu , Xin Ma , Shaokai Ren , Xiuyun Lei , Laijun Liu

The role of B-site ions of Bi0.5Na0.5TiO3 (BNT) on its complex phase transition remains unclear due to its polarization attributing to both Bi and Ti. In this paper, the phase transition of (Bi0.5Na0.5)0.94Ba0.06(Ti1−0.01b/4B0.01)O3 (BNT6BT) (B = Nb, Mn, Fe, and Cu) ceramics was modified by low-concentration donor doping (Nb) and acceptor doping (Mn, Fe, and Cu) in order to determine the origin of phase transition behavior. The phase structure, microstructure, local structure/lattice vibration, phase transition temperature, and dielectric properties of BNT6BT-Nb, Mn, Fe, and Cu ceramics were investigated. Results showed that all samples formed a single perovskite phase at room temperature, and donor (Nb) and acceptor (Mn, Fe, and Cu) doping can regulate the ratio of R3c and P4bm coexisting as nanoscale entities. The grains show polyhedral morphology, and average grain size lies between 1 and 2 μm. The Raman spectroscopy study shows that doping modification can change the phase transition temperature. The relation is in well agreement with the three different dielectric anomalies derived from the dielectric curves of er versus T. Low concentration of cation (Nb, Mn, Fe, and Cu) doping can tailor the dielectric permittivity, depolarization temperature, and phase transition temperature of BNT6BT. All samples exhibit a large dielectric constant and good frequency stability.

中文翻译:

(Bi0.5Na0.5)0.94Ba0.06TiO3 中 B 位阳离子的可调相变

Bi0.5Na0.5TiO3 (BNT) 的 B 位离子对其复杂相变的作用仍不清楚,因为其极化归因于 Bi 和 Ti。在本文中,(Bi0.5Na0.5)0.94Ba0.06(Ti1−0.01b/4B0.01)O3 (BNT6BT)(B = Nb、Mn、Fe 和 Cu)陶瓷的相变通过低-浓度施主掺杂 (Nb) 和受主掺杂 (Mn、Fe 和 Cu) 以确定相变行为的起源。研究了 BNT6BT-Nb、Mn、Fe 和 Cu 陶瓷的相结构、微观结构、局部结构/晶格振动、相变温度和介电性能。结果表明,所有样品在室温下都形成了单一的钙钛矿相,并且施主(Nb)和受主(Mn、Fe 和 Cu)掺杂可以调节 R3c 和 P4bm 作为纳米级实体共存的比例。晶粒呈现多面体形态,平均晶粒尺寸介于 1 和 2 μm 之间。拉曼光谱研究表明,掺杂改性可以改变相变温度。该关系与源自 er 与 T 的介电曲线的三种不同介电异常非常一致。低浓度的阳离子(Nb、Mn、Fe 和 Cu)掺杂可以调整介电常数、去极化温度和相变温度BNT6BT。所有样品均表现出较大的介电常数和良好的频率稳定性。低浓度的阳离子(Nb、Mn、Fe 和 Cu)掺杂可以调整 BNT6BT 的介电常数、去极化温度和相变温度。所有样品均表现出较大的介电常数和良好的频率稳定性。低浓度的阳离子(Nb、Mn、Fe 和 Cu)掺杂可以调整 BNT6BT 的介电常数、去极化温度和相变温度。所有样品均表现出较大的介电常数和良好的频率稳定性。
更新日期:2020-03-13
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