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

• 作者: Xingxing WU Shouyu WANG Winnie WONG-NG Qiang GU Yao JIANG Chao WANG Shuang MA Weifang LIU
• 来源期刊: 先进陶瓷（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: Research Article
• 页码范围: 120-128
• 页数: 9页
• 语种: 英文

摘要

Hybrid improper ferroelectric Ca3Ti2O7 and Ca3Ti1.9Ru0.1O7 ceramics were successfully synthesized by conventional solid-state reaction method. Two strongest diffraction peaks located around 2θ = 33° 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.