Polar Domain Structural Evolution under Electric Field and Temperature in the (Bi0.5 Na0.5 )TiO3 -0.06BaTiO3 Piezoceramics,Journal of the American Ceramic Society

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Polar Domain Structural Evolution under Electric Field and Temperature in the (Bi0.5 Na0.5 )TiO3 -0.06BaTiO3 Piezoceramics
Journal of the American Ceramic Society ( IF 3.5 ) Pub Date : 2018-07-03 , DOI: 10.1111/jace.15883
Jinyan Zhao _{1,

2} , Nan Zhang ₁ , Wei Ren ₁ , Gang Niu ₁ , David Walker ₃ , Pamela A. Thomas ₃ , Lingyan Wang ₁ , Zuo-Guang Ye _{1,

2}

Affiliation

Lead‐free bismuth sodium titanate and related compounds are of great interest as promising candidates for piezoelectric applications. However, the full understanding of this family of materials is still a challenge partly because of their structural complexity and different behaviors with or without the application of an external electric field. Here, piezoresponse force microscopy is used to gain insight into the mesoscopic‐scale domain structure of the morphotropic phase boundary (MPB) composition of (1‐x)Bi0.5Na0.5TiO3‐xBaTiO3 solid solution at x = 0.06 (abbreviated as BNT‐6BT). The evolution of the domains with the changes of the electric field and temperature has been thoroughly examined in conjunction with the crystal structure analysis and dielectric studies. It is found that ferroelectric domains with size of hundreds of nanometers are embedded in a relaxor state without visible domains on a mesoscopic scale, which are considered to contribute to the tetragonal and cubic phases in the material, respectively. Temperature‐independent domain configuration is observed in the unpoled sample from room temperature to 200°C. While, temperature‐dependent domain configuration is observed in the poled sample. The homogenously poled state breaks into the mixed domain configuration containing polydomain structure and invisible state around the so‐called depoling temperature. The structural changes on different length scales are also discussed. This work provides an in‐depth understanding of the structural and domain changes under an electric field and the temperature‐dependent domain evolution in both unpoled and poled states in the BNT‐BT solid solution of the MPB composition.

中文翻译：

(Bi0.5 Na0.5 )TiO3 -0.06BaTiO3压电陶瓷在电场和温度下的极畴结构演化

无铅钛酸铋钠和相关化合物作为压电应用的有希望的候选物引起了极大的兴趣。然而，充分理解这一系列材料仍然是一个挑战，部分原因在于它们的结构复杂性和在施加或不施加外部电场的情况下的不同行为。在这里，压电响应力显微镜用于深入了解 (1-x)Bi0.5Na0.5TiO3-xBaTiO3 固溶体在 x = 0.06（缩写为 BNT- 6BT）。结合晶体结构分析和介电研究，已经彻底检查了域随电场和温度变化的演变。发现数百纳米大小的铁电畴嵌入弛豫态，在介观尺度上没有可见畴，这被认为分别有助于材料中的四方相和立方相。在从室温到 200°C 的未极化样品中观察到与温度无关的域配置。同时，在极化样品中观察到温度相关的域配置。均匀极化状态在所谓的去极化温度附近分解为包含多畴结构和不可见状态的混合畴配置。还讨论了不同长度尺度上的结构变化。

更新日期：2018-07-03

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