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Abstract
Hybrid improper ferroelectric Ca3Ti2O7 and Ca3Ti19Ru0.1O7 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.
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Details
1 Tianjin University, Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, School of Science, Tianjin, China (GRID:grid.33763.32) (ISNI:0000 0004 1761 2484)
2 Tianjin Normal University, College of Physics and Material Science, Tianjin, China (GRID:grid.412735.6) (ISNI:0000 0001 0193 3951)
3 National Institute of Standards and Technology, Gaithersburg, USA (GRID:grid.94225.38) (ISNI:000000012158463X)