Novel optical properties and induced magnetic moments in Ru-doped hybrid improper ferroelectric Ca3Ti2O7

被引：19
|
作者：
Wu, Xingxing [1 ]
Wang, Shouyu [2 ]
Wong-Ng, Winnie [3 ]
Gu, Qiang [1 ]
Jiang, Yao [1 ]
Wang, Chao [1 ]
Ma, Shuang [2 ]
Liu, Weifang [1 ]
机构：
[1] Tianjin Univ, Sch Sci, Tianjin Key Lab Low Dimens Mat Phys & Preparing T, Tianjin 300072, Peoples R China
[2] Tianjin Normal Univ, Coll Phys & Mat Sci, Tianjin 300074, Peoples R China
[3] NIST, Mat Measurement Sci Div, Gaithersburg, MD 20899 USA
来源：
JOURNAL OF ADVANCED CERAMICS | 2021年 / 10卷 / 01期
基金：
中国国家自然科学基金;
关键词：
oxides; electronic materials; optical properties; X-ray diffraction; defects; lectronic structure; ferroelectricity; MULTIFERROIC PROPERTIES; DOMAIN-WALLS; PEROVSKITE; COMPOUND;
D O I：
10.1007/s40145-020-0425-2
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Hybrid improper ferroelectric Ca3Ti2O7 and Ca3Ti19Ru0.1O7 ceramics were successfully synthesized by conventional solid-state reaction method. Two strongest diffraction peaks located around 2 theta = 33 degrees shifted towards the lower angle region with Ru substitution, reflecting structure variation. Grain growth and higher oxygen vacancy concentration after doping resulted in a reduction in the coercive field about 20 kV/cm. Optical bandgap estimated by UV-vis diffuse reflectance (DR) spectrum and X-ray photoelectron spectroscopy (XPS) valence band spectra showed a decreasing trend due to the existence of impurity energy level upon Ru doping, which was consistent with the results of first-principles calculations. The origin of the unexpected induced magnetic moments in Ru-dope Ca3Ti2O7 is also discussed.
引用
收藏
页码：120 / 128
页数：9
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