TY - JOUR AU - WU, Xingxing AU - WANG, Shouyu AU - WONG-NG, Winnie AU - GU, Qiang AU - JIANG, Yao AU - WANG, Chao AU - MA, Shuang AU - LIU, Weifang PY - 2021 TI - Novel optical properties and induced magnetic moments in Ru-doped hybrid improper ferroelectric Ca3Ti2O7 JO - Journal of Advanced Ceramics SN - 2226-4108 SP - 120 EP - 128 VL - 10 IS - 1 AB - 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. UR - https://doi.org/10.1007/s40145-020-0425-2 DO - 10.1007/s40145-020-0425-2