Hybrid improper ferroelectric Ca₃Ti₂O₇ and Ca₃Ti₁₉Ru_0.1O₇ 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.

通过常规固相反应方法成功地合成了混合不当铁电Ca ₃ Ti ₂ O ₇和Ca ₃ Ti ₁₉ Ru _0.1 O ₇陶瓷。两个最强的衍射峰位于约2 θ= 33°通过Ru取代移向下角区域，反映了结构变化。掺杂后晶粒生长和较高的氧空位浓度导致矫顽场降低约20 kV / cm。由紫外可见漫反射光谱（DR）和X射线光电子能谱（XPS）价带光谱估算的光学带隙由于Ru掺杂时存在的杂质能级而显示出下降的趋势，这与第一阶段的结果一致原理计算。还讨论了Ru-掺杂Ca ₃ Ti ₂ O _7中意外感应磁矩的起源。