Orientation dependence of electric field induced phase transitions in lead-free (Na0.5Bi0.5)TiO3-based single crystals
Orientation dependence of electric field induced phase transitions in lead-free (Na0.5Bi0.5)TiO3-based single crystals
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无铅 (Na0.5Bi0.5)TiO3 基单晶中电场诱导相变的取向依赖性
DOI：
10.1111/jace.16238
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发表时间：
2019
影响因子：
3.9
通讯作者：
Luo Haosu
中科院分区：
文献类型：
--
作者：
Chen Chao;Wang Yaojin;Jiang Xiangping;Tu Na;Chen Yunjing;Zhou Shulan;Xia Xiang;Shen Zongyang;Luo Haosu
研究了0.92(Na0.5Bi0.5)TiO3–0.06BaTiO3–0.02(K0.5Na0.5)NbO3(NBT–6BT–2KNN)单晶中电场诱导应变和相变的取向关系。拉曼光谱随电场的演化表明，对于[001]取向的单晶，初始诱导的四方铁电相为ATE=14KV/cm，并在=25KV/cm以上完成。当电场沿[111]方向施加时，触发了从伪立方结构到菱面体结构的部分相变，ATE=19KV/cm，高于沿[001]方向诱导四方铁电相的相变。NBT-6BT-2KNN单晶的场致相结构和稳定性都与晶体取向密切相关。这些结果为更好地理解无铅NBT基铁电体的场致宏观应变提供了依据。
The orientation dependence of the electric field induced strain and phase transitions in 0.92(Na0.5Bi0.5)TiO3–0.06BaTiO3–0.02(K0.5Na0.5)NbO3(NBT–6BT–2KNN) single crystals has been investigated. The evolution of Raman spectra with electric field reveals that a tetragonal ferroelectric phase is initially induced atE=14 kV/cm and completed aboveE=25 kV/cm for [001] oriented single crystals. When the electric field is applied along [111] direction, a partial phase transition from pseudocubic to rhombohedral structure is triggered atE=19 kV/cm, which is higher than that for inducing tetragonal ferroelectric phase along [001] direction. Both field‐induced phase structures and stability of NBT–6BT–2KNN single crystal are strongly associated with the crystallographic orientations. These results provide a better understanding to the field‐induced macroscopic strain in lead‐free NBT‐based ferroelectrics.