钽酸盐
铁电性
材料科学
压电
兴奋剂
掺杂剂
拉曼光谱
电介质
介电常数
铌酸钾
凝聚态物理
偶极子
矿物学
光电子学
光学
化学
复合材料
有机化学
物理
作者
Yu Wang,Ping‐Heng Tan,Xiangda Meng,Zhongxiang Zhou,Xiaolin Huang,Chengpeng Hu,Fei Huang,Jing Wang,Hao Tian
出处
期刊:IUCrJ
[International Union of Crystallography]
日期:2021-02-24
卷期号:8 (2): 319-326
被引量:5
标识
DOI:10.1107/s2052252521000890
摘要
Ion doping, an effective way to modify the nature of materials, is beneficial for the improvement of material properties. Mn doping exhibits gain of piezoelectric properties in KTa 1− x Nb x O 3 (KTN). However, the impact mechanism of Mn ions on properties remains unclear. Here, the effects of Mn doping on local heterogeneity and piezoelectric properties in KTN are studied. The electric field-induced strain of Mn-doped KTN is ∼0.25% at 10 kV cm −1 , 118% higher than that of pristine KTN. Meanwhile, as a result of Mn doping, the dielectric permittivity was tripled and the ferroelectricity was modified. The changes in A 1 (2TO), B 1 + E(3TO) and E(4TO) vibrations characterized by Raman spectra indicate increased local polarization, weak correlation of dipoles and distorted lattices in Mn-doped KTN, respectively. First-principles calculations demonstrate stronger local heterogeneity introduced by Mn dopants, which weakens the dipole correlations and reduces domain sizes. As a result, the decreased domain sizes, combined with the larger ratio of lattice parameters c and a of the Mn-contained portion, are responsible for the higher piezoelectricity. This work reveals the impact on properties of KTN from Mn dopants and the prominent role of local heterogeneity in improving piezoelectricity, being valuable for the optimization and design of material properties.
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